Tuner Renntech initaliy came out with their own tuning package for the SLR 722 which boosted the supercar's power up from 650hp to 722 horses, and now by popular demand the tuning house has pumped yet more ponies out of the 5.4-liter supercharged engine bringing total power up to 740hp
For the upgraded tuning package Renntech have re-worked the ECU software and added a less restrictive motorsports-style exhaust system to get the extra ponies to the new Renntech Signature 10-spoke, 3 piece performance wheels.
via http://worldcarfans.com
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