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iconoclast i can promise you this, if its anything like the e90 m3 bmc filter drop in, you can tell the difference inside the cabin immediately. I took my car in for service one time, when i got the car back on the way home the sound was off, and i had an AA exhaust on it but knew it didn't sound right, i opened up the air box and found they took my bmc and tossed it for a stock filter, the dealer had to buy me a new one!
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