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MPPK and Exhaust was the best thing we did to my wife's 335i Xdrive. She's auto and we've smoked C6 Vettes off the line almost up to 100mph+. The exhaust dump between gears and the backfires are so unique, she gets so much attention from it.
The noise it makes after it breaks in is amazing. I borrow hers just to hear it because the overrun is amazing compared to the stock noise my F80 makes. Only thing I like more is the Competition Package noise on the M3.
The HP numbers depend if you have the electronic wastegate and if you're auto. The power is better, but MPPK is only the first step. I would recommend going Dinan after that. MPPK is required to do any power modding to these cars.
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