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·I replaced the engine with a 350 out of a Chevy 1/2 ton PU. I am also installing a pair of Flowtech 11100 headers. Wanted to purchase the flowmaster before I went to the muffler shop. I want 40 series but I haven't been able to find out for sure if they will fit. I would like to run at least 2 1/2 pipes. Please help.