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I have one of these....
If you are at stock power levels( no tune) you wont pickup any noticeable power increases, but you can hear your turbos swoosh more..... I like it.
If you have a tune that is approaching 400 crank horsepower, they make a big difference as the stock filter becomes limiting at higher rpm's....
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2011 e92 M3 Monte Carlo Blue ESS 535 - gone but not forgotten
2015 cayman GTS - new toy
2006 SLK 55 AMG sold
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