thats a very nice torque curve! what are the other plots though? they seem interesting too.
i can understand your loyalty to bmw. i have the same feeling for honda, even though they are polar opposites in some respects.
i think you should just be happy with what youve got, ive always favored it, however i dont think building the engine for an extra 2lbs of boost is worth it. are there any other althernatives for a power increase? a quality header maybe? i understand the rest of the package is pretty complete, so a quality aftermarket header should provide some very healthy gains if you dont have one already. i say save the $.
and if what uli says is correct about the fastest e46... then the e46 is definitely a poor choice if your unsatified with what you have now.
cliffnotes:
-dont get an e46
-dont bother rebuilding the engine for minimal gains
-find another alternative to free up power and/or throw the $ you have saved for the project into flourishing mutual fund or stocks and buy the m2
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