Closed Track Testing! 2006 Heffner 730 hp Ford GT vs 2012 RENNtech Mercedes Benz CLS63 – Road Test TV

We recently obtained a video of a 2006 Heffner modified Ford GT doing some testing against a 2012 Mercedes Benz CLS63 modified by RENNtech.  We were told that the testing occurred at a private facility South of Stuttgart (we’re glad to hear that as we do not condone street racing).  The Ford GT in the video is a beast with a supercharged Heffner modified 5.4 liter V8 making nearly 730 horsepower. However, the sedate looking RENNtech powered Mercedes Benz CLS63 AMG is no joke as its 5.5 liter V8 BiTurbo makes some serious power as well. Watch the video to see the outcome. Enjoy.