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Old 07-21-2008, 09:17 AM   #14
WildBillyT
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Quote:
Originally Posted by WayFast84 View Post
What do you think is less restrictive, the dynomax ultra flow or magnaflow's 4" race muffler?
Probably the race muffler. A 4" race muffler is basically an open pipe with fiberglass around it.
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