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Your input is important to us. Please provide your valuable feedback. Here are some testimonials from our clients:

Mr. Bologna, Thank you very much for all your help this past week with the ECU upgrade for my ML. I was very impressed with the turnaround time, and I am very pleased with the results. I will be sure to remember RENNtech well in the future. I appreciate your time and efforts. Best Regards, Alex   Posted By: RENNtech

Hi John, First I would like to thank you for all your help in getting the ECU upgrade with BMC filters to my GL450. What a difference in performance the upgrade has made. The acceleration and torque after the tune was completely unexpected. The average mpg now is around 18.5 @ 80mph and I am able to get sometimes 20-21mpg driving at 70mph! I am extremely happy with the upgrade and I'm highly recommending you and RENNtech to all my German (MB, BMW, Audi, and Porsche) friends! Thanks again, Ali S.   Posted By: RENNtech Inc.

Mitchell, well done to you and your team at Renntech for exceptional service! I drove my G63 AMG today after the Renntech ECU upgrade with BMC filters and it's a beast! The tune exceeded my expectations, it's completely docile and silky smooth around town but step on the gas and it rips. The monstrous torque is addictive; hard to believe there is such a big improvement on an already fantastic M157 motor. Thank you Mitchell for taking the time to discuss the upgrade and answer all my questions before moving forward on the tune. You're a enthusiast that knows your product and it was a first class experience for me from start to finish. I would highly recommend you and your team at Renntech! Kind Regards Desmond   Posted By: RENNtech Inc.

Big Shout Out to RENNtech! I worked with John and had shipped and re-installed with the M278 Tune for my 2013 GL450. It is amazing. During normal subdued driving in 45mph zones you just glide along. You never really have to get the RPMs over 3K or use much motr than 40% throttle. I find it easiest to just set the cruise and bump it up and down by 5 mph. Super easy to manage heavy traffic, I leave it in D and it just wonderful! On I-540 heading to Research Triangle, where traffic routinely runs 80+, my GL is right at home in 7th gear. My only mileage check was on a pretty spirited 351 mile round trip from RTP to Gaston County, NC and back. Avg.speed was 69 mph, and mileage was 18.2! I was very impressed with the customer service, especially with questions I had after the tune was installed. I am 100% pleased with the decision to go with RENNtech!! - Steve B.   Posted By: RENNtech Inc.

Just worked with John B on an ECU tune for my E63s and am seriously blown away at the performance difference! Power increase for the dollar is an insane value! Easy instructions and very helpful along the way. Now saving up for downpipes and mufflers! - Mike H.   Posted By: RENNtech Inc.

(...)I also want to thank Renntech for coordinating everything on my behalf. Not only did they respond back to my e-mail on Sunday, they called me first thing Monday morning to setup an appointment with Axels Automotive, local Renntech dealer to replace the spark plugs as the first step in troubleshooting. The service didn't stop there. After I picked up the car, I received a follow up call from Renntech. This was around 6pm local time. While I didn't expect this level of service, it was much appreciated and I'm very happy with my choice. Ryan | 2012 - W212 E 63 AMG 4MATIC   Posted By: RENNtech Inc.

Good morning Mitchell, I spent quite a bit of time in the car this weekend and I thought I would share a few impressions. I like the exhaust note from the mufflers as it is just what I was looking for. Deep tone, not too loud, lets you know it’s there without being overbearing. Along with the air filters I can tell the car “breathes” much better. I am quite impressed with the increase in performance. My right foot is still being re-trained as having driven the car for 8 months now, my right foot had become accustomed to pressing down certain amounts for different effects. Now, I have no aspirations to race or take the car out to a track and I don’t care that much about Dyno values (except for maybe bragging rights). What I do care about is how the car has become more fun to drive and that’s the bottom line. Mercedes made this Mille Miglia edition with aesthetic additions and for the life of me I couldn’t understand why they didn’t add some performance upgrades as well. I now feel RennTech has enabled this car to be the car it should have been all along. I am thinking that maybe mounting the RennTech badges I might gain another 10 HP? Thanks for taking the time to answer all my questions and being extremely vigilant and helpful through the process. Best regards, Steve Pummill   Posted By: RENNtech inc.

Mark S, Thank you again for your help with my ECU tune. Pulled the ECU on Monday and had it installed by noon on Wednesday! The engine is now a true beast!! Could not ask for a better experience. All the best, Blair   Posted By: RENNtech

John, I wanted to follow up with you in regards to the tune you guys performed on the S63AMG on Feb. 4th! Simply Amazing! The car does triple digits without even trying. I find myself constantly cruising at 93mph and feels as if I'm doing 65mph Thanks again, John   Posted By: RENNtech

Mark, Happy Thanksgiving to you and the family. I would like to express my extreme satisfaction at the quality of customer service you extended me with my CLA 45 project (turbo upgrade with diverter valve, ECU upgrade, and downpipe). Renntech might have just hit a home run with this car. This car has become a whole new machine. It begs to be pushed and I know I will oblige as I enjoy this further. I will certainly recommend any of this upgrade to my fellow ’45 owners. The price of admission is reasonable especially for a reputable outfit like Renntech. I look forward to possible new upgrades to make an excellent car superlative in every aspect. Thank you very much! Aldo   Posted By: RENNtech