Hissing from hfc, is it a rumor?

Originally Posted by Jordo! Switching to a larger diameter Y pipe will create a very load hiss. Replacing OEM cats with unreasonated HFC's or TP's will result in farty rattle.

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Hissing from hfc, is it a rumor?

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04-28-2015, 11:46 AM

#19 (permalink)

Nick M

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Quote:

Originally Posted by Jordo!

Switching to a larger diameter Y pipe will create a very load hiss.

Replacing OEM cats with unreasonated HFC's or TP's will result in farty rattle.

Both will be primarily on decel around 2.5 K or so RPM.

Only solution is to go OEM diameter Y (or Nismo OEM H), and resonated HFC/TP or LTH. Other than that its hit or miss to fix. Good luck...

None of this is true.

I did not have a hiss when I replaced my OEM y-pipe with my AAM y-pipe and catback.

I did not get a farty rattle when I swapped my OEM cats for FI test pipes.

Resonated test pipes can and will usually hiss just like non-resonated will.

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