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I know AMGeneral did. But the HMMWV used GM's 6.2/6.5 and trans. Unless AMGeneral hobbled the headers together. You're probably right, GM probably only just supplied the engines and AMGeneral did whatever to them.

Yeah the HMMWV's "Headers" look like some backwoods-engineered hunks of crap. Something tells me GM just kinda threw them together to fit the Hummer. As for performance. yeah, on all the fuel stuff. I know there are marine injectors for 6.5, mayeb there are some that would work for 6.2's. I've...