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The first AMG GT-S arrived at RENNtech Headquarters in Stuart, FL and underwent immediate software testing for U.S. conditions and U.S. 93 octane fuel.
RENNtech’s German Engineering facility directly at the Nurburgring has done extensive dyno testing since March 17th 2015 and with three cars running, racked up well over 2,000 miles of high speed testing on the Nurburgring and the German Autobahn.
With the pre-developed software, it only took us a few days to make adjustments for the U.S. and get the car on the track at Palm Beach International Raceway.
Although conditions were not optimum due to the hot, humid weather in Florida, the GT-S ran with an intermediate software version at 11.28 sec at 128.11 mph quarter mile.



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Nice, but does this kind of work void the warranty? Just curious. ;)
 

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I wonder the same thing because I'm considering the ECU upgrade for my CLS550.
 

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My guess is no, in that most Mercedes dealers are also authorized RennTech dealers/installers.
 

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Nice, but does this kind of work void the warranty? Just curious. ;)
Absolutely. Even though many dealers sell Renntech tunes & parts, MB/AMG has stated that modifications by any tuner void the warranty (via the AMG Private Lounge).

If you have issues with a dealer installed tune, they will probably take care of it for you; but if you blow an engine MBUSA will start looking closely. If evidence of a tune shows, you're probably SOL.

If you want to play, be prepared to pay.
 
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