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

Dear Mark S,

I wanted express my greatest appreciation for all the great work you and Renntech did on my 2012 E63. I loved driving my car before I had the chip upgrade but now I'm "in love" with driving my car. I don't mind telling my wife that I need to run errands around town anymore, I look forward to driving my car all the time. My car not only performs better, but the new down pipes give the car an incredible sound. This was my first experience dealing with Renntech, and between your professionalism, the quality of the products, and the technicians workmanship, I am a satisfied customer. I will be back soon for the carbon fiber splitter and the Renntech sport mufflers.

Thank you again for all your assistance,

Sincerely,

Noah R.

2012 (W212) E63 ECU & Down Pipes
 
Posted By: RENNtech
Hey Mark S,

It's been nearly 2 months since I had my car dealership install the re flashed ECU from you guys on my brand new 2014 E550 4matic. I cannot begin to tell you how much of a difference it has made.

Throttle response alone has dramatically increased over stock. The claimed increase in HP and Torque is no joke! The acceleration is unmatched on the highways---a true sleeper! It feels very similar to my friend's '14 AMG version, minus the $100K price tag.

In some respects, it's like driving a car with split personalities. It's a great day to day driver to and from the office when you select "Economy Mode" for the transmission shift points. And then once you put it into "Sport Mode", it transforms into caged cheetah begging to go faster and faster! I could not be happier with my investment.
I would also like to personally thank Mark S at Renntech for answering all of my questions and initial concerns. He is a true professional. Thanks again Renntech staff for everything.

Brad T.

2014 (W212) E550 4MATIC
 
Posted By: RENNtech
Dear Mark S.

I have a 2007 SL65 AMG and wanted to boost up my power to get my adrenaline
flowing a little more. After researching a lot online and looking at various
options I finally decided on The RENNtech ECU Upgrade.
I left an email saying I was interested and got an email back from Mark Squadrito
immediately. Mark was very articulate and easy to understand. He walked me
through the whole process which turned out to be a piece of cake and so
worth it.

Within a couple of days as promised both my horsepower and torque
were boosted up giving me an unlimited supply of adrenaline. Mark even gave
me his personal cell number so he could be reached in case I had any
additional questions.

I can't say enough about Mark Squadrito and RENNtech.

David S.

2007 (R230) SL 65
 
Posted By: RENNtech
Hi Mark S,

It was a pleasure after several phone calls to come in and meet the whole crew at Renntech.

I am particularly grateful for all the sound no nonsense advice you gave regarding my S 65 AMG. You instinctively knew how much information I had and you were able to explain exactly what I was hoping to achieve.

The upgrades that I decided to do perform exactly as you described . I've found it hard to believe that's the software upgrade would fix the shifting issues the transmission has but your professionalism, no nonsense approach and dedication to doing the right thing swayed me to give it a shot.

Everytime I fire up the V12 I'm glad I did the upgrade and am grateful for the professional manner in which everything was handled.

Living here in SoFlo I have the opportunity to run into a bunch of other guys that have had some Renntech upgrades and 10 out of 10 speak highly of your organization.

Sincerely,

Daniel L.

S65 AMG (W221)
 
Posted By: RENNtech
Dear Mark S.,

I would like to thank Mark Squadrito and his team at Renntech for giving me such good service and performance.

They were able to modify my Mercedes Benz Engine Control Unit overseas within a very short time. We did encounter one glitch, which they handled very efficiently. They even sent me a replacement E.C.U. while the glitch was sorted out. These guys wasted no time at all. I feel absolutely confident in dealing with Mark Squadrito and his people in the future for other modifications.

Thank you,

Steve G.

2014 Mercedes CLS 350
 
Posted By: RENNtech
Mark S,

Thank you for the excellent customer service RENNtech showed me today when I brought in my Cooper S. I will continue to tell other MINI owners about the excellent customer service and products you have to offer.

Jacob H.

2013 Mini Cooper S (R56)
 
Posted By: RENNtech
I would like to say thank you to Mark Squadrito at RENNtech for all his help. I have a 2013 Mini Cooper that I brought down to for a tune. Mark was great then, even bought me lunch, and also when I needed to mail the ecu after a dealership program upgrade. He made it easy and in all steps along the way.

Sincerely,

Mark C.

2013 Mini Cooper S
 
Posted By: RENNtech
Hi Mark,

Just want to let you know the ECU and intercooler kit you sold me for the 2006 SL65 worked amazing the vehicle drives like a unleashed wild animal cannot believe the difference.
Also thanks for your help and expertise you definitely guided me into the right direction.

Bob M.

2006 SL65 (R230)
 
Posted By: RENNtech
DEAR MARK S.,

THANK YOU FOR ALL YOUR HELP AND DIRECTION ! I PURCHASED THE ECU TUNE FOR MY 2014 CLS 550 4MATIC! WHEN I FIRST BOUGHT THIS CAR I WAS BUMMED BECAUSE I REALLY WANTED THE CLS 63 AMG! HOWEVER THE BANK WOULDNT APPROVE ME FOR $115,000!!! SO I SETTLED FOR THE $79,000 CLS 550 KNOWING THAT I WAS GOING TO BE LACKING THE POWER I DESIRE!
AFTER SEARCHING THE INTERNET FOR PERFORMANCE UPGRADES I STUMBLED UPON YOUR PRODUCTS! (I FOUND IT HARD TO BELIEVE THAT I WOULD GAIN SO MUCH POWER FROM A SIMPLE ECU TUNE) AFTER SPEAKING TO YOU I DECIDED TO GO FOR IT AND BOY O BOY AM I HAPPY!!!!!! TRULY AMAIZING !!!!!!! YOU TURNED MY CAR INTO A CLS 63 AND SAVED ME $35,000!!!! TO ANYONE WHO IS ON THE FENCE ABOUT THIS, DON'T BE!!!! ITS WORTH EVERY PENNY!!!!

THANKS AGAIN MARK!!!!

IZZY A

CLS 550 Biturbo (M278)
 
Posted By: RENNtech
Mark . S.

I wanted to say thanks to you and your team for a great ECU upgrade experience . It's rare today to find anyone in sales that delivers what they promise and even rarer for them to exceed expectations. You and your team scored 10/10 in the customer service experience. I am not new to the Renntech experience as I have had a 2002 C32 AMG with ecu and pulley upgrade and most recently a 2006 slk 55 with ecu and carbon fiber airbox which you personally helped me with back in 2010. Both of these were excellent mods and went without any issues. In fact, I drove a combined 100k miles on these two vehicles prior to trading in without any modification issues.

But by far the best upgrade has been my sl550 ECU 515bhp upgrade. Under light throttle application it is a noticeable yet very subtle increase in forward thrust. More aggressive throttle application produces progressively more power and torque combined with more exhaust volume and a slight increase in turbo volume. It is an amazing evolution for this car's character as opposed to a massive makeover or revolution. It will behave like a sedate grand touring vehicle if need and can roar like a beast if pressed.

I can recommend this modification without as single reservation as the best available in the market . Mark is a quintessential professional at all times.

Sincerely,

Richard H.

2014 SL 550 (R231) M278
 
Posted By: RENNtech

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7825 SW Ellipse Way - Stuart, FL 34997
TEL: 561.845.7888 FAX: 561.845.6777 E-MAIL: info@renntechmercedes.com