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      01-25-2013, 01:46 AM   #6
buildbright
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Drives: 335i BMW F30 Sedan
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Quote:
Originally Posted by 2Quack View Post
I was considering a mpe but not so much if it is just to improve the sound. My next problem is if I were to install an aftermarket exhaust would the increase in performance decrease my fuel economy? If so I would have to stick with the mpe. LOL
Any performance part will decrease your fuel economy because you will be driving more aggressively. The performance exhaust is great but if it adds anything it will be like 5hp.

No performance exhaust will add much as ours is designed almost perfect. You want some good performance get a BMS JB and maybe a downpipe.