Part of the difference in the M3 and the M Roadster may NOT lie in the difference in length. It may be that the different engine bays necessitate different intake and/or exhaust manifolds or plumbing. It's the same as the C5 Corvette making 345hp from the original LS1 and the F-body cars making 320hp from the same engine. The exhaust manifolds were different, and the exhaust plumbing in the engine bay was different. That is just my observations. Length probably does have some effect, though.
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Generally speaking, if you were to get what you really deserve, you might be unpleasantly surprised.
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