Hi Lee,
Afraid I agree, you will get more noise and a different throttle response, but you won't get 40bhp, not without opening-up the engine and changing to a racing cam shaft, manifold etc...
Best
Jonathan
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M3 CSL, Silver Grey, 2004, Factory de-limit, Alcon BBK, Rogue Rear Control Arms, Turner Top Mounts, Braille CF Battery
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