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I would actually go against an aftermarket exhaust...feel like if you wanted a growl, you should have gotten a 335.
IMO, you should do mostly exterior...tint, coilovers, M3 trunk lip, aftermarket rims or 189s, underspoiler kit.
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2015 BMW X5 35i M-Sport (White/Brown) - 4/16/18 (Current)
2011 BMW 550i M-Sport (Jet Black/Cinnamon Brown) - 4/30/14 | 2007 BMW 328xi e92 (Jet Black/Coral Red) - PAST | 2005 Infiniti G35 Coupe (Ivory White/Stone) - PAST | 2005 Acura TSX (Obsidian Black/Black) - PAST
| 1998 Acura Integra (Black/Black) - PAST
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