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Message: <blockquote data-quote="Rayhwc" data-source="post: 745156" data-attributes="member: 23396">I used BMW M Performance on my 535i so I am not sure if its relevant to you or not.  No issues with warranty, but thenagain I had no problems with the engine to complain about.  Sound is slightly louder than stock.  Simple plug and play as the exhausts even come with clamps for installation.  No need to retune, no problems as the engine runs as smoothly as before.  My fuel consumption increased because I step on gas more just to hear the sound <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />.Was fun. Am older now and preferences change, so selling my exhaust in the classifieds.</blockquote>