Thread: What is the difference between HFC and test pipe?
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Old 07-06-2010, 04:30 PM   #32 (permalink)
nolan1016
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Quote:
Originally Posted by Westwood View Post
thats what i said 12" = loudest +tp = best gains. i was looking at the dyno sheets and test pipes have a few more hp compared to the sheet with hfc's
non resonated would be louder then 12", if thats what you meant.
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