Removing weight would be material and amount of cats/resonators/etc. deleted. A single custom titanium exhaust would be your best bet for weight reduction.
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Current: 2010 Alpine White 335D LCI l 19" BBS LMs l KW V2 Coilovers l BMW Performance Grilles l MSport Front/Rear l Karbonwerke Trunk l F1 Pinnacle Tint 35% Former: E92 Space Grey 335i Latest pics
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