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I'll do these with 1 3/4" to 1 7/8" with the 3 1/2" collectors like you suggested.

Started doing the cutouts in the fenderwells last night, not too bad. Should be a fairly easy build as far as stepped fenderwell headers go!!!!!:rolleyes::LOL::LOL::LOL:

Or, if you build weird stuff like I do, your header's come looking like this...some assembly required!!!!! Would you believe nobody makes fenderwell headers for an '82 Camaro??????:LOL::LOL::LOL:
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Hard to beat the quality of Sanderson.....