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DPP Aeroturbine 4040XL Cat-Back Exhaust Kit 04.5-07 5.9L Dodge Cummins

here is where i got mine, it comes with the pipe to over come the factory muff offset in/outlet.

i put mine on my 06 QC and left the cat. muff swap basically. i loved it sounded great not raspy not to loud but could hear it when u got on it and sounded killer at idle.

MPG well like all these things....to they improve the efficiency yes but dont expect much.

 

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cat pipe is prob just a str8 piece of pipe. the other over comes the off set inlet outlet of the factory muffler