Testimonials from C6 Grand Sport owners:David L 2013 Grand SportHad my 60th GS programmed by Jim while he was near Chicago last week as well.

Levent E – 2011 Grand Sport

Hello All,

I met Jim Mero and his wife in Boca Raton, FL on their way to West Palm and Vero beach. He loaded the new tour and the super-sport on my 2011 GS with MN6 and F55. I am the original owner of this car and it was factory orders as per my specs short of 4LT interior.  Let me say first, I was a very huge skeptic of this upgrade, like others posted here, I loved what it had, and funnily enough I drive on factory sport mode more than 50% of the time even in city as it settles down that touring gyrations.  I almost called Jim the night before to cancel it, I was very afraid loosing that Corvette rawness. I brought it straight home and today I went for a 60-mile test drive on the very worst roads I know along Federal HWY, all the way down to Ft Lauderdale in tour than back in Super-sport.

Fist the tour. Jim you are a magician, how the h.. did you do that? It goes over bumps and dips and manhole covers nary a complaint, which I had to maneuver around before and If I could not, I had to brace myself for the jolt. No longer required. Yet car is as planted, even more so than before! what a difference! that alone was worth the price.

Super-sport. It looks like this is now my default setting unless I am really in a very bad section of the roads. Now I realize factory sport mode which I loved so much was so excessive. (I do not track the car but love to drive the heck out of it roads permitting). I would bet that I would be now much faster with it even on a track. Coming back I took this over pass which is one way with sequence of corners right, left and right like a Chapel at Silver stone. I usually blast through those corners on sport setting when there is only me on the road. I am always feathering the throttle as the car hangs in perfect balance between the apexes right on the edge (It feels like). With the new super-sport, I swear I was at least 10 MPH faster on those corners as the car never felt close to the limit, and I was way on the throttle and exiting out early where I would have been trying to keep the rear end from coming around before (it has happened one time). That was wow!

I am no longer a skeptic, a believer now. This car now has the world class suspension, it is amazing, it breaths a whole new life in to it. The only one downside, My fuel mileage will go way down :-). However I am still ahead, I had taken off my old wheels with worn out Michelin super sport non run flats and put on new GS wheels with original Auto Transmission GY run-flats, not G2’s like the original on F55 GS’s (which Jim noticed and queried me about) that were never used before (not heat cycled and kept protected). I was ready to switch to some PS4 ‘s very soon, very tired of the harshness. The good news is that this suspension mode turned those devils in to angels, it is no longer a money I have to spend now, and can wait until they wear off.  So I am actually ahead!!!!. For anyone who on the fence about this upgrade, guys, you will be missing much if you don’t have it. It is a must. This is not just the best bang for the money, like an atomic bang type of a bang in comparison to 500 LB dumb bomb. Thank you Jim!

Jason M – 2012 Grand Sport

I met Jim and his wife to flash my 2012 centennial edition grand sport on 12/29/20. The update of New Touring and Super Sport was immediately noticed. The car rides so much better on the highway and city in either mode. I can actually feel the difference when I change the modes now. If you’re like me you are wondering if it’s worth it, the answer is YES. The best money I spent for the car.

Gary M – 2013 Grand Sport

A huge Thank You Jim Mero! After I put about 1000 miles on my 2013 Grand Sport since the MRC upgrade all I can say is WOW, my wife gifted me with a great Christmas gift. The suspension difference is amazing in both Tour & Sport settings. My car no longer acts as though it hates my lower back. It now behaves as I would expect a streetable performance vehicle should. It no longer feels always stiff and the damping keeps the car under control at all times. Smooth as silk during the pleasure drive and holds the road like a track car when driving more aggressively. The car is controlled and well behaved under acceleration through the corners with no sensation of bouncing or skidding when the road conditions aren’t perfect. I love it Jim and now I do not have to prepare my low back for impact when the road conditions turn ugly. I recommend this upgrade should be on on the list for all owners of the 2009-2013 C6 Corvettes with MRC. Again WOW!

David L 2013 Grand Sport

Had my 60th GS programmed by Jim while he was near Chicago last week as well.

Great guy and the best upgrade ever.

At first when I left and got on a nice and even road, I couldn’t tell a difference, I still felt everything the suspension was doing; probably even more so than before.

But later when the road got rough is when you really feel the difference. The car just doesn’t get upset over large bumps like before, the body moves a lot less because the suspension is doing the work. It’s incredible. It’s like going from a solid axle to independent rear suspension because the car doesn’t jump over the big stuff anymore like it used too. Always composed.

 If you’re trying to decide whether this is worth it, it is. Knowing what I know now I think this upgrade is worth more than Jim is asking for it. Thank You Jim.

Brian B – 2013 Grand Sport

Had Jim Mero update my ’13GS yesterday with the New Tour and New Sport calibrations. My, My. What a difference! Car rides better and handles better.

I was skeptical at first but no more. Awesome upgrade!

Gary M – 2011 Grand Sport

Jim, Your programming has transformed the suspension and body control. Genius! The whole feel is an amazing improvement. It’s a distinct upgrade easily appreciated. Completely composed over a bad bridge seam, potholed road , and my driveway entrance. All challenging surfaces. Great job! Thanks for a fantastic improvement.

Boyd H – 2013 Grand Sport

Just had my cars magnetic ride tuned by Jim Mero and all I can say is wow!! It rides like it’s never rode and in super sport mode it hooks and handles leaps and bounds over the stock sport setting! This made me fall in love with my car all over again! Thanks Jim Mero.

Tim M – 2013 Grand Sport

I have a 2013 GS with ECS supercharger. I purchased this upgrade (Tour and Sport) from Jim during this Covid19 social distancing. I installed myself with the help of his instructions and You Tube videos. Prior to purchasing, Jim was responsive to my questions. I decided not to get super sport upgrade since I don’t plan to track it. The module arrived a couple of days after I ordered and I received my core deposit back as soon as he received my core module back. I didn’t have to follow up which was great.

I immediately noticed a difference in ride on my short test drive post install. I had it in Tour mode and the ride was noticeably smoother on the terrible PA roads. Since then I have driven my GS on many short drives (20-30 minutes). The ride is incredible. I have challenged curves in sport mode and the GS handles amazing – hugs the road even on uneven surfaces.

This past weekend I took a road trip of about 160 miles round trip via highway and back rural roads. Tour mode was so smooth on highway it almost doesn’t feel like a sports car, almost. Accelerating is a fun reminder that it is American muscle at it’s finest. Put it in Sport mode for the back roads and had fun with the winding roads. I didn’t feel any body roll; it just clings to the road.

I have about 500 miles driven since upgrade and feel that was enough of a trial to highly recommend this upgrade!

Jeff D – 2012 Grand Sport

I got the car back together this week.  Thanks so much for the awesome turnaround on your end.  I had a chance to get behind the wheel again and I can’t believe the difference.  Somehow you managed to get rid of the harshness without losing the sports car feel in the new tour mode.  The super sport mode is equally impressive, plenty of damping and cornering control again with less of the harshness.  I’m really happy with the way this upgrade turned out.  I think this is the best modification I’ve made to date.  The C6 Corvette community is very lucky to have you behind them.  Thanks again of a great product and your help getting it into my car.  See you on the road!

Ron H – Denver, CO – 2013 Grand Sport

Today I had my 2013 Grand Sport MRC upgraded with Jim’s new version at Keller’s Automotive in Centennial, Colorado they did an excellent job and you can really feel the difference in the handling of the car. An awesome Improvement in the handling and the drive, you can feel the difference.

James C – 2011 Grand Sport

I always believe the MRC was a better system then “just” shocks or coil overs. When I learned there was an update to the system, via the guy that built it, I jumped at the chance.  Jim was attending The Caravan, so I contacted him to make an appointment. I was able to meet Jim prior to the upgrade and even sat through one of his classes to learn more about his history with Corvettes and MRC.  I chose the New Tour and Super Sport for my 2011 Grand Sport.  I like a tighter handling car and do occasionally track but wanted a better ride and control.  The upgrade was just what I expected.  I feel a larger difference between the two settings now, tour is less harsh, but it still drives like a Vette and the Super Sport is fun with better body control, lighter steering and bad roads are less of a problem.  The car handles much better in all conditions and settings. Overall it is a great upgrade that I highly recommend.

Hopen, Lawrenceville, GA – 2013 Grand Sport

I just had the Jim Mero Magnetic Ride Controller Upgrade (Jim Mero Vehicle Dynamics LLC) installed on my 2013 Grand Sport Corvette. Boy, it is like driving a different car and what a fantastic improvement in the driving experience! What was surprising is the modest cost of the upgrade controller and the modest cost to have a local garage (Mahdavi Motorsports, Lawrenceville, GA) install it. A number of options are available for the upgrade but since I don’t tack my car I got the Tour/Sport upgrade. In Tour mode my car rides so much smother and the car is really enjoyable to drive. But the biggest improvement in the Sport mode. I seem to have a lot more control of the car when going around curves and the steering seems a lot more firm. You really feel the road but it does not beat you up when you hit a rough spot. I can’t say enough how delighted I got the upgrade to my car! I urge anyone with a C6 with the MRC option to check out Jim’s website at https://jimmero.com/ and get it installed on their car. I don’t think you will regret it.  T. Hopen, Lawrenceville, GA

Dr_gallup, 2013 Grand Sport -Upgraded at Charlotte

I had the upgrade programmed this weekend, Jim put in the New Tour / New Sport calibration at Rick Hendricks Motorsports. I took I 85S to Gastonia, north on NC 321 & west on I 40 and must say the ride over expansion strips was much smoother in New Tour. The tires still make a big wallop noise of course but you don’t feel the sharp slap. But no wallowing or floating, a noticeable improvement. Then I picked up NC221/226 before turning off on 226a (Diamondback) which is just a wonderful piece of pavement. Very tight and twisty and the pavement is in excellent condition. Switched to sport mode and it handled great. At little Switzerland I got on the Blue Ridge Parkway and took it south to NC 80 (The Devil’s Whip). This road is much rougher and here the new sport calibration really shined. The car was much more composed over broken up patches of pavement. Very pleased with the change, well worth it. I drive a lot of these mountain 2 lanes, tons of fun

Kevin H – 2012 Grand Sport

Just met with Jim Mero tonight as he was passing through. He upgraded our 2012 Grand Sport Convertible with the New Tour / New Super Sport. The ride down was a bit choppy in factory Tour mode. The ride back home was much nicer. Up the hill on my street in Sport mode was another new experience. Update:  took the GS Convertible out this evening. Up Rte 60 through Hawks Nest. Tried both the New Tour and Super Sport modes. Even in Super Sport the bumps and divots in the road are not as harsh. Much more compliant than before. I will be taking it to the SWVR SCCAs last autox of the year next weekend providing the weather is good. Can’t wait! So far, I am very happy with this upgrade. My wife told me she thought it was less harsh and abrupt over the bumps too. I like it. Great upgrade. Thank you Jim,

Mike C – 2012 Grand Sport

Just had my C6 GS done by Jim, it’s only a week but it’s like having a new car. Touring mode is now the way it should be. The car rides over bumps and those expansion joints in the road very smoothly and sport mode is very responsive. Thanks again for all your help. Mike.

Bob M – 2013 Grand Sport

Out here in Sonoma County, California we have some of the worst kept roads in the state, maybe the whole country. Even in town main roads cry out for an SUV. My 2013 GS just about required a month piece to prevent chipped teeth. I have used Jim’s New Tour/New Sport for a week now over the worst roads both in town and out. The “jarring” initial hit is gone. It doesn’t hop sideways over the rough payment in tight corners under acceleration when driven hard anymore. The difference between tour and sport is quite noticeable. I can’t imagine staying with the stock programming and missing out on enjoying the car as it was meant to be.

Greg B – 2012 Grand Sport – Upgrades at the NCM Caravan

WOW! What a difference!  My wife has some medical issues and is very sensitive to vibrations, pressure changes, etc.  She RELLY noticed a difference in the removal of the “harshness” that your code offers.  We went over the course of 5280 miles on our 19 day 20 State tour.  Your Code for Shook Recalibration is Terrific.  It really makes a difference. Thanks again Jim!  The ride home (about 3000mi) was wonderful.

John S – 2012 Grand Sport

What an amazing difference. I noticed it as soon as I got out on 22 leaving the dealership. Even more on 270 heading home with as rough as it is in some places. I had the upgrade done in our 2017 Grand Sport. I could tell the difference but not even close to the difference it has made on the 2012. I honestly think if I was blind folded now, I would have a hard time telling which car I was in.  A huge thanks for making this available. Thanks for accepting my Facebook request so I can follow along. Best of luck to you and please let me know if I can provide anything else. Conti is going to hook me up with one of your signed posters since I forgot to have you sign the car. Talk to you soon. Thanks, John

Bob L – Grand Sport – Flashed at Carlisle

I’ve put about 500 miles on my car since the upgrade. I want to thank you for the software upgrade (new Tour and Super Sport) you and Terri did on my 2012 Centennial Grand Sport at Corvettes at Carlisle 2019! While I wasn’t unhappy with the car’s ride and handling as it came from the factory, I thought that with your credentials I just had to get the upgrade.  Boy am I glad I did!  The harshness is gone, and the car feels so much more settled in both modes.  Previously, my car always skipped over a washboard road near my home. Now, In either Tour or Super Sport the car soaks up those bumps so controllably I can’t believe it! The car now feels so much more planted and stable under all road conditions and speeds.  By the way, I think this upgrade also eliminated most of the wheel hop/drivetrain shake that I previously experienced on hard launches and shifts. 

John G – 2011 Grand Sport – Upgraded at Carlisle

Jim it was a pleasure speaking with you at Corvette’s at Carlisle. I had the mag ride upgrade done on my 2011 GS and what a difference. Prior to the upgrade there wasn’t really any noticeable ride difference between Tour and Sport(track). Now the difference is significant. The biggest change is in the Tour mode that now provides a much more refined ride, minimizing rough road surfaces that prior to the upgrade caused the car to bounce around. I noticed the difference in the feel as soon as I departed the fairgrounds. Handling is also improved. This was money well spent!

Mark E – 2012 Grand Sport – Upgraded at Carlisle

Thank you for upgrading my MRC on my 2012 Vette Grand Sport – I must say I felt a positive difference within a few miles of driving. I had a chance to thoroughly experience the difference when I drove from Glasgow Kentucky to Houston Texas – anyone with MRC who wants a better ride quality should do this upgrade.

Jim A – 2013 Grand Sport

“Jim and Terri Mero stopped by the Indianapolis area on their way home from the NCM 25th Anniversary celebration to upgrade three C6s. I thought the ride of my 2013 GS with MRC was pretty darn good as it was. After reading about the ride and handling improvements after Jim’s upgrade, I decided to proceed. The improvement in the ‘Tour’ mode was noticeable right away. It reduced the harshness over bumps, irregular surfaces, and pavement transitions without sacrificing the great Corvette sports car feel. My wife noticed the reduced harshness right away also, so we are both very pleased with the upgrade.” The improvements is ‘Sport’ are similar to ‘Tour’, yet it’s still a ‘Sport” mode. The MRC upgrade makes me a really happy camper. Update: The MRC upgrade is wonderful. The more I drive the GS the more I enjoy the feel of the ‘new’ car. Thank You for stopping by on your way home.

Craig F 2013 Grand Sport – – upgraded at Carlisle

I went to Carlisle yesterday and had Jim do his upgrade on my 2013 Grand Sport Coupe with the 6-speed manual and dry sump.

I could tell a difference as soon as I headed home from Carlisle, Pa. to Baltimore, Md.

My route was basically a two-lane road for about 60 miles, that varies from 25 mph while passing through several small towns with bumpy roads, to stretches of 55 mph smooth up-and-down winding mountain passes. It’s a fun drive, and there were lots of Corvettes driving to and from Carlisle.

What I noticed was my Tour setting, which always seemed comfortable but maybe too floaty and leaning for a Corvette, now feels appropriately controlled, but by no means uncomfortable. I’ve only driven those 60 miles, but it seems now to be about perfect for daily driving.

My Sport setting, on the other hand, usually seemed really stiff . . . . I did use it when I was on back roads driving quickly and again it bothered me as too stiff.

Sometimes I wish there was a setting in the middle of the factory Tour and Sport modes. That seems to be exactly what Jim gave me . . . two new settings, both in the middle of the original factory settings.

And I do not track the car so I doubt I will ever miss the original factory Sport setting.

I bought my car new and searched for a 2013 Grand Sport specifically with the F55 suspension. I have intentionally kept my car completely stock . . .so doing this reprogram was my first and only modification. I have absolutely no regrets . . . the suspension is clearly improved.

If you’ve got a C6 with the magnetic ride option I highly recommend Jim’s upgrade.


Joni L – 2013 Grand Sport – upgrade installed in New Stanton PA

It was great that Jim could make a stop enroute to Carlisle. I haven’t driven a lot since the upgrade but so far, I’m very pleased with my upgrade.

The ride quality is improved, and the car seems to drive better. I have lower back issues and can tell the difference between before and after pretty easily.

I don’t track the car and do a good bit of my driving on the back roads in my area. The GS seems to have better turn in now. The upgrade is the best thing I’ve had done for this car besides getting Michelin tires.

The GS drives better and feels better on our crummy PA roads.

Meeting Jim and his wife was wonderful, great people.

I highly recommend Jim and his upgrade!

Tom S – 2012 Grand Sport – upgraded at Carlisle

Thanks, Jim. The ride home on Thursday after your calibration was amazing.  The ride down to Bowling Green with the calibration you loaded onto my car at Carlisle made the trip very enjoyable. Thank you!

Jason M – 2011 ZR1 – upgraded at Carlisle

Jim, thank you. I cannot overstate what a difference the upgrade did with my ZR1. I am beyond amazed with the improvement it made. Thank you again and it was an honor to meet you today!


Norby Dippold – 2011 Grand Sport – New Tour/New Sport

Well after a 1370-mile road trip with the changes in place on some of the ugliest highways (I69 MI) in America I am convinced that this is one of the best changes that I have made to my 2011 C6 GS. In Tour mode those highway bumps/jars seemed to go away, the car was more stable and easier to drive hence more fun to drive. There was less slap over those tar strips on the highway and the car seemed less noisy inside. The GS feels happier now and I am much happier now.  This is the way the C6 GS should have come!   Jim, I owe you a great deal of thanks as you made driving my C6 GS much more fun!



                Much better ride quality

                Stable and planted

                Gives you greater confidence


                Easier to drive

                More fun to drive



Trey F, Rio Rancho, NM 2012 Grand Sport

I installed the module this evening. I have to say, it’s an impressive difference in the ride quality for normal city driving It’s a wonderful vehicle, and the ride is amazing now. Thank you very much. I am proud to have this in my car. Overall, it has improved with the update dramatically. Thank you again for the module and customer service. I am very happy.

Bill (2013 Grand Sport Conv.) and Larry (2009 ZR1) who drove up from Indianapolis, IN

Both Larry and I are really happy with the upgrade along with the wives too! Neither of us really knew what to expect and are more than pleasantly surprised and certainly glad we did it. All I can say is that I noticed the change as I backed out of your garage as the tires rolled over the expansion strip and didn’t jolt as before.

In the drive afterwards to the motel we could feel the changed ride and after overnight the difference was fully felt by both drivers and riders. The Corvettes are now more compliant over rougher roads and just have a much better feel overall.  It really does make the Corvette more fun to drive. As I told Larry had the upgrade been available before the C7 came out there may have been less C6 owners giving theirs up.

Mike – 2011 Grand Sport Convertible.

Last year I purchased a C6 Grand Sport convertible.  I bought the car in Texas and drove it back to Michigan.  In the fall of 2018, Jim asked if he could upgrade my car to get my thoughts. The transformation is unbelievable! The pleasure of driving the car in either tour or sport can’t be understated.  On my drive back from Texas I never put it in sport.  Now I do almost all my driving in sport. If I just want a nice cruising car, tour is perfect.  In both tour and sport, the car just glides over the bumps that used to beat me up bad.  Also, I noticed how much better the steering is, which surprised me.  Now I can’t imagine driving the car without the new programs.

Ross W – 2011 Grand Sport Coupe

After a total of 10 hours of seat time.  In both tour and sport.

Mix of freeway 55-90mph with hours rural backroad and small-town slow driving. 

I like this new cal so much. Both tour and absorb the bumps very very nicely and are still stable and composed.  Everyone will notice a considerable difference.

Galen C – 2012 Grand Sport

Just wanted to let you know how happy I am with the driving improvement. Drove over 250 miles yesterday. I am no expert but would say the car feels much more stable, planted, kind of hard to describe but driving over rough pavement sections has a sense that the suspension is working much more refined. These are really nice cars and your program just adds to the experience.   Galen