Quote:
Originally Posted by Neverenoughboost
No the s54 wasn't detuned.
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Quote:
Originally Posted by JB3CK24
This is correct.
S54 in Z4M and Z4M Roadster and even the later 2001 Z3 M Coupe/Roadster had subtle exhaust differences that limited the power to 315 hp in some cases.
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Not quite correct. The Z4 M Roadster/Coupe have 330 horsepower, just 3 horsepower less than the exact same engine in the E46 M3. As you said, the difference is in the length of the exhaust system, much shorter in the M Roadster/Coupe.