Re: big block exhaust
Unless you're over 500hp, 2 1/2" seems to be the recommended size. I spent some time at Doug Thorley's shop in SoCal and that's what they recommended. I've got a 2 1/2" ceramic coated mandrel bend system with Walker Dynomax Hemi Turbo's. The system was custom bent and installed using stock exhaust manifolds and ran $1500 with the H pipe. It's a work of art and not cheap but is quiet in the interior with no resonance. When you jump on it, it roars but doesn't overwhelm.
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Jim
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