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i have a 72 duster 340 stroker will hooker super comps fit my car these are 1 3/4 headers the engine builder recommended getting bigger headers i bought hooker competition headers a few months back but there 1 5/8 so he said the dyno will pull different numbers with bigger headers. should i get...

This week i purchased a set of flowmaster 40 series for my dads 72 cuda 340. He has a set of dynomax ultraflows on them but we want more noise so are 40 series a good muffler and would give a lot more sound? thanks. 416 mopar