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Hey guys,
Im wanting to put flowmaster 40 on my denali, I may do just single in and out but I may do duals Im not sure yet. But mainly what I want to know is I was talking to someone about this and they recommended if I do the exhaust to install J pipes to lower the drone in the cabin. Where do I get J pipes? Would the shop that installs the flowmaster have them or something? And also to anyone that has 40s I think they sound great but hows the drone in the cabin? I know the denalis have some extra insulation but dont know how bad I need the J pipes. Also how expensive are J pipes? I heard they were expensive? Thanks everyone!
 
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