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      12-12-2012, 03:10 PM   #19
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Drives: E90 325i
Join Date: Jan 2006
Location: SF Bay Area

Posts: 1,752
iTrader: (23)

AA exhaust is muffler delete with resonance chamber to reduce drone.

I think AA claims about 4-5 hp gain in the development stage, which is not bad for a system like this.

You will get more hp gain if you do 2nd cat delete or even primary cat delete.
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