Renntech Bangs 548 Horsepower out of Mercedes C63 AMG:
Renntech set out to reverse these restrictions and give the C 63 a power figure to be proud of. An initial ECU software upgrade put the power up to a CLK63 matching 475hp until the tuner had more time to hammer out the engine a little more. This hammering has now been complete with an updated version of its ECU software, RENNtech's stainless-steel long-tube headers and new, track-oriented sound/performance pipes bringing the power figures up to 548 peak horsepower and 510 lb-ft of torque.
Renntech also found time to bang in a height adjustable suspension kit and a new stopping power enhancing braking system.
It'll be interesting to see what kind of performance figures the Renntech C63 is capable of should they decide to release them in the future, however Renntech do tease that an overpowered & 63 monster could make its way through their factory doors for their 20th anniversary celebrations.
Source: Renntech via Jalopnik

More pics and article in here: http://www.worldcarfans.com/9080905....rcedes-c63-amg
And the brakes, honestly - any of you feel like you're not getting enough braking? LOL. Stainless lines, yes - I'll take the pedal feel please. But replace the brakes on these cars? why bother?! These brakes rock!
http://www.autoblog.com/
brabus puts out 530 HP and 479 lb-ft
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http://www.autoblog.com/
brabus puts out 530 HP and 479 lb-ft
$20,000

And that's just for Headers and ECU. Those guys really have a screw loose.
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