you will notice a sound difference. Love the 3 inch sound.
i did full all the way back 3 inch on a 68 FB conv and a 70 GTO. Both needed a lot of cut, fit and re weld even with kits. used American Thunder on Bird and Pypes on Goat. Bird had to trim the quarters since little room between leaf and lower quarter panel. I agree that it may not give a whole lot of power at that hp level.
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 [SIGPIC]
Steve
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