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I got my 340i before the MPPSK was out and then added it as soon as it was released, so I've driven the car with and without. I'm a big fan. The sound is amazing, but still livable in the cabin. The workmanship on the exhaust is incredible, just a very high quality piece, looks better than any aftermarket exhaust I've ever owned. And the power bump is noticeable, if not game-changing. Overall I'm very happy with it, the way I see it you are paying the market rate for an well-crafted catback exhaust (aftermarket alternatives are around $2k) and then another $1000 for a 30hp tune with full warranty. Plus the whole kit is well-integrated and emissions compliant. I haven't regretted it for a second.
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