Quote:
Originally Posted by bmwfan1
Ive read several times that they are a direct swap with n55 mids. I have an x-pipe in mine and it sounds deeper but not too noticeable until you get 4k + in the rpm's and then it sounds like an exotic. Im with 3" dp's as well as FBO with factory axleback exhuast.
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i'm pretty sure you can only swap 135 n55 midpipes to a n54 135. I also installed an x pipe in my e90 and then did the golf t mod. I will say the golf t made more of a sound difference than my ar dp's and x pipe combined.