Renntech Project E63 (w212)
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2004 SL500
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2002 S430, 2004 Cobra, 2004 Tahoe
I guess they really aren't lying about the 20% drivetrain loss. Wonder if they can get about another 100rwhp with the Renntech goodies. Should definitely be interesting.
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Porsche Macan S SportDesign / Ex M-B's: 11 & 10 & 06 E350's, 02 S500
Transmission mostly, however pretty much everything that gets in the way of the HP until it physically reaches the rear wheels is to blame as well.
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E63, S550
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I think the problem is that the 6.2 doesn't loosen up until it hits a few thousand miles, so dynoing a low mileage 6.2 will show lower hp numbers.
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E63, S550