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What is the difference between HFC and test pipe?

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

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		Nissan 370Z Forum > Nissan 370Z Tech Area > Engine & Drivetrain > Intake/Exhaust
What is the difference between HFC and test pipe?

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07-06-2010, 12:05 AM	#26 (permalink)
OhYeah Base Member Join Date: Jan 2010 Location: Thailand Posts: 79 Drives: 370z 40th Rep Power: 16	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?? Last edited by OhYeah; 07-06-2010 at 12:13 AM.

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