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      01-20-2013, 05:58 PM   #5
Wrngway
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Drives: '11 328i Sedan A6
Join Date: Jul 2011
Location: D.C. Metro

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The exhaust should fit an N52 as intended with no issues. Check the emissions sticker under your hood. If it says SULEV then you have an N51. ULEV is N52.

I assumed I had an n52 till I checked. If you haven't looked, you really should. I was a bit surprised.

On N51's the pipe after the resonator is a larger diameter than the N52 cars and I needed to have it welded on. For N51 cars, a couple inches will need to be cut off of the AA exhaust so that it'll weld up properly.

I have some pictures on a review thread I posted a few months back if you're curious.
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