Yet Another FI Exhaust Review. 56k GG.

Originally Posted by spearfish25 My understanding is that the 18" is quieter, so people probably tolerate volume addition of the HFCs better. I'm sure Tony can comment for you though.

		Nissan 370Z Forum > Nissan 370Z Tech Area > Engine & Drivetrain > Intake/Exhaust
Yet Another FI Exhaust Review. 56k GG.

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02-16-2010, 08:18 PM

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Quote:

Originally Posted by spearfish25

My understanding is that the 18" is quieter, so people probably tolerate volume addition of the HFCs better. I'm sure Tony can comment for you though.

Lower frequency sound has longer wave lengths. In basic logic the idea of the 18" is to reduce lower frequency noise than the 12". "Quieter" is simply a vague term based on how we hear. Reducing a lower frequency noise source may not sound quieter because our hearing is more sensitive to higher frequency noise.

Saying all that above.... I have the FI resonated test pipes with the 18" CF resonators and really like the sound.

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