Quote:
Originally Posted by 135forthewin
Hey, has anyone run aftermarket downpipes (catless or high flow catted) and catless midpipes with the stock axleback with their n54 135i?
If the axle-back isn't too restrictive I've got a buddy who wants to keep it on his car, and have that stealth factor and convenience of the jb4's CANflap feature.
Thanks in advance!
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Mine is an N55 but here is some food for thought. The piping on my stock muffler and my BMW Performance muffler are the same size. I'm talking about the piping from the muffler to the flange where it attaches to the mid pipes.