From Our Clients

  • 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!! 💜

    Sharon K.

  • 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!

    Kamren W.

  • 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.

    Nick V.

  • 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.

    Matt C.

  • 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!

    Logan O.

  • 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.

    Phil M.

  • After having another shop work on tuning my GTO with terrible results, I was recommended to Rios Racing by a few local guys. I drove the car to him and within minutes he found the issue and fixed the tune. From that experience I decided to let him put a LSA supercharger on it and tune it as well. It was spot on and his attention to detail exceeded my expectations. I have recommended him to all my friends and family. Now he is working on my 2650 supercharged 427 in the GTO

    Dylan G.

  • Working with Mark has been a game changer for my TT CTS V - Been working with him since 2025 and the performance gains are incredible, would recommend to anyone looking for top notch work and expertise

    Jason K.

  • Mark has consistently demonstrated exceptional patience and a commitment to delivering outstanding results. We're looking forward to completing our current project. Big Rios Racing 🤙🏾

    Daquan S.

  • Mark tuned my 2019 GMC Sierra 6.2 and absolutely nailed it. The truck feels brand new—way more torque off the line and overall it’s smoother and more responsive. He was a pleasure to work with, asked exactly what I wanted out of the tune, and delivered. 10/10 would recommend.

    Josh M.

  • Proven tune ups over and over and over and over and over and over 🤙🏻

    Francis B.

  • Me and Mark go way back, he tuned my 5.3 turbo SW 10 years ago and she is still running strong like day. My boy Mark is the man when it comes to this tuning sh!t

    Raheen F.

  • Rios got my 09 CTSV running like a beast, 1200+ whp and daily drive able (minus the tires lol). I’ve been working with him for the last 3 years on my own V going through multiple changes since. Street tuning we made 1064, dialed in on the dyno almost

    Garth T.

  • Recently did stage 2 cam, lifters, springs, intake, etc. on 2018 sierra 5.3L . Was referred to Mark with Rios Racing. Was told he was the best around for LS and LT engines. I could not be happier with the outcome nor did I expect how healthy my truck would be after he was done with it. Probably gained 100+ HP and even on 35x 12.50’s with 7” lift I have gained about 3-4 mpg average. This guy doesn’t just guess, his knowledge of tuning these things is incredible and impressive! Super stoked and grateful I went sent his way!

    Paul. P.