I'm at 1,400 miles now and my 435i does not sound significantly louder from new. But it sounds quite nice in Sport+ mode, though it's definitely still very quiet compared to my other cars. Looking to get the M performance exhaust on very soon. Definitely need to hear the exhaust more.
Quote:
Originally Posted by cjack
PPK was installed about 2 weeks after receiving the car. Also did the "golf tee" modification (just unplugged and taped so no dirt goes into the connector and cable). Took about two days after the PPK was installed and it appeared to get louder. The downshifts (in sport) mode sound awesome ("burble").
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Does the M performance exhaust drone at all? If it only brings out the burble more then it sounds like the perfect exhaust for me as the 435i is my daily.