A lot of people seem to go with Magnaflow 14815.

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Dinan F&R strut tower brace, M5 F&R sway bars, Koni Sports, Eibach springs, Dinan stage 1 engine and trans software, Zionsville cooling kit, resonator delete, Dinan exhaust, AFE cai, 18' style 5's, 235/40/18 275/35/18, and some small cosmetics, with more to come.