Quote:
Originally Posted by Double-L
I was watching horse power tv or could have been what ever was on after it but they had the making of flowmasters on and was showing the hp gain with their mufflers, Not only did they say the flows make more hp than any other muffler out there it made more hp than open headers on the dyno, That was hard for me to believe
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Back pressure is often a good thing! My '69 Chevelle 396 thought so.
