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    Most Efficient Cold Air intake & muffler for a Chevy P/U 2012 2500hd

    Dear Duramax experts: I have a 2012 2500hd CHEVY P/U with a Duramax engine. I plan to install a cold air intake , exhaust (DPF) back, plus a power PUC. My question is; what would be the most efficient exhaust and cold air intake combo to go with? Thanks :thumb: