If Mark only knew what he was getting himself into when he walked over to us at the track to offer some help. 5 years later, he has proven time and time again that he does great work. He is attentive to what our goals are and getting us there. His support for us and our racing program is top notch! Ty for everything and can’t wait for the next phase!! 💜

I’ve dealt with several other tuners with previous LS platforms & decided to let Mark do my 12’ GS after numerous people recommended him. Needless to say, I wish I had him do all of my previous builds as well. Not only did the car get faster with each revision, but it ran / drove smoother than anything else I’ve owned. If you’re looking for a top notch tuner, Mark is undoubtedly your guy!

Working with Rios Racing has been the best tuning experience I’ve had to date. All of my questions are always answered, he helps me troubleshoot issues when needed and my car is noticeably faster and smoother than it was before he tuned it. 10/10 experience.

I have owned two cammed Ls cars in the past and while they made good numbers on the dyno there were always small but annoying drivability issues with two different local tuners. After hearing good things from several people, I brought my C7 to Mark when it was just intake and headers and then again after I installed a blower kit. The car drives like a bone stock car without a single issue. He really knows what he’s doing with the Ls/Lt stuff. Top notch work, he is a wealth of knowledge and very easy to deal with. I won’t bring my stuff or send anyone I know looking for a tune to anybody else.

Been having Rios racing tune my cars since like 2017. Currently have a 2014 Escalade, 2011 CTSV, and 2000 corvette all with bigger cams and bolt ons tuned by Rios Racing. Always been more than satisfied with their top notch tuning and customer service!

Took me 5 years after moving to the east coast to decide a tuner. Twin turbo 6speed manual car. Rios Racing took the time to learn the cars wants/needs. Educates his clients with do's and don'ts. This car is one of the only factory ecu 5th gens with rolling antilag.