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What is the difference between HFC and test pipe?

Originally Posted by m4a1mustang There is NO performance difference between 12" or 18" resonators. The resonators only affect sound volume. thats what i said 12" = loudest +tp = best

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Old 07-06-2010, 02:54 PM   #29 (permalink)
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Quote:
Originally Posted by m4a1mustang View Post
There is NO performance difference between 12" or 18" resonators. The resonators only affect sound volume.
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
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Last edited by Westwood; 07-06-2010 at 03:00 PM.
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