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Message: <blockquote data-quote="Mr. OAM" data-source="post: 192565" data-attributes="member: 9816">ryclef331, unless you've got one helluva blower pumping through that engine there isn't an N/A 331 that will benefit from a 3" exhaust unless it is a track only car. On the street you will lose scavenging and torque in low to mid RPM. Top end HP could suffer too, flip a coin on that. Very few 400 cu. in. engines can benefit from a 3" exhaust in a street driven car. I would do some more research. Wife's 1966 Mustang with 331 stroker.....when we bought the car it had a 289 and no-name dual exhaust with turbo mufflers. Sounded like crap. Built the engine into a 331 and it sounds great through the same exhaust, plus headers.Doug Thorley Tri-Y headers, ceramic coated at Hi-Tech Coatings in Virginia.No-name dual exhaust with turbo mufflers.No tipsSounds like a race car.No audo clip at the moment.Steve</blockquote>