4 XP Series downpipe back exhaust for 2001-2007 GM Duramax 6.6L (LB7/LLY/LBZ). T409 stainless steel construction with T304 polished muffler and tip for durability and performance.
Remanufactured long block engine (tow/haul series) for 2007.5-2010 GM 6.6L Duramax LMM. Includes upgraded components for heavy-duty use. Core charge applies.
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