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...
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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.