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Re: exhaust manifolds?
I think Holley actually rates these at around 550 horsepower. I've never seen documentation as far as testing by independent shops. My opinion which really doesn't matter to anyone are seem to be quality made super smooth finish inside with no excess casting flash also outside coated inside out runners flow smoothly into the main. Everything just appears to flow so nice. They dump out the bottom nicely with no funny angles. Would not hesitate to buy another set.
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