Guys with Renntech upgrade i have a question for you...
Is your warranty on your w211 e55 gone after the upgrade?
The dealer's service department actually did the physical installation of the pulley - Autowerks Direct supplied all the parts and programmed the ECU.
Autowerks Direct also offers the RENNTech Warranty protection for the life of the factory warranty, should anything fail and there's a problem with the dealer giving warranty (got it on paper).




