Not Ranked
BOURRET,
That is a kind of hard question to answer as it will depend on the type of mufflers and exhaust you have now. On my 69 Ford Cobra with the 439 CI. the factory used MOPAR Hemi mufflers because they were the lowest restriction ones back then. I have two huge exhaust pipes and I think they told me I would gain maybe 5 to 10 horsepower if I disconnected the mufflers. Not enough to mess with unless you are racing and the noise is defening. When we started it in the garage, it shook all kinds of tools and cans off the guy's shelves. If you have the restrictive super quite type then you would gain more than I could. Try running your set up through desktop Dyno and that will give you a pretty good idea of what you can gain. Sorry I can't be of more help, but maybe some of the guys that have more experience in this area than I do can tell you more.
Ron
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