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This FLO~PRO 4" cat back single is for the 2001-2007 GM 2500/3500 6.6L DURAMAX LB7-LLY-LBZ. It replaces your restrictive OE System with an improved 4" mandrel-bent exhaust. This kit not only sounds great but will improve the torque, mileage, and throttle response on your 6.6L! With this system, you can expect great sound and superior performance coming from stock.
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