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For cat-back (and no xpipe), the BMW M Performance exhaust is a nice option. Been very satisfied with mine. Can get it for around $3.2K USD with a parts coupon/promo at some local dealers or some online dealers who offer free shipping. For a cat-back, it's actually one of the few that had any performance gains, (per Eurotuner Magazine test) without any funny hp/torque dips, there is zero drone, is very civilized (not booming noise) at idle, sounds great at WOT, is designed by BMW engineers for the perfect sound, you still have full warranty coverage, and is much cheaper than other weight-saving Inconel systems on the market.
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