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I just installed the AA axel-back today on my 2011 135i 6MT N55.
1: The tips stick out pretty far but i dont mind and i think it looks good.
2: Yea theres drone that can be big but why care?
3: Well I dont FEEL any, but i know they are there because the AA is like 3x lighter than stock and its really free flowing with that big 3.5" piping.
4: MAYBE mid-pipes or DP.
This exhaust sounds really good on the N55 but i was a little disappointed because i was expecting it to be a bit louder but im thinking its gonna open up in a few hundred miles. The fitment on mine is actually a little off and i dont think i installed it wrong. its just that the curve in the pipe comes REALLY close to that suspension arm.
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