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What is the difference between HFC and test pipe?

Originally Posted by OhYeah what is the different between w/ 12" Resonators w/ 18" Resonators just a sound? which one is louder? What about the performance? any power gain or

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Old 07-06-2010, 08:29 AM   #27 (permalink)
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Quote:
Originally Posted by OhYeah View Post
what is the different between w/ 12" Resonators w/ 18" Resonators
just a sound? which one is louder? What about the performance? any power gain or loss?

and what is O2bung, what is it use for? and what does it mean polished by stainless?
Any different from the normal one?? Does the carbon fiber give different sound from the normal one or just the look??
FI 12" with test pipes will be the loudest + more gains. thats the combo im getting and the Carbon finish is for esthetic's only.
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