HFC with stock exhaust??
You are not going to feel huge gains, but you will pick up some sound. I went with the HFC, because its cheaper than a new exhaust right now. They need to be replaced anyways, I would replace them first than go from there. I am going to change the ypipe out in the next few months too. Just like the way the stock exhaust sounds.
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he meant you have to replace them (stock cats) anyway with either HFC or test pipes (whichever one you decided), so go for em and you can replace the y-pipe and muffler later.
thanks for the help guys
thanks for the help guys
Originally Posted by texasZ350
he meant you have to replace them (stock cats) anyway with either HFC or test pipes (whichever one you decided), so go for em and you can replace the y-pipe and muffler later.
thanks for the help guys
thanks for the help guys
Exactly
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From: Miami, FL
sound clips on the Z fellas! here's a sound clip of FI HFCs on 'ShanesG' on Driver. yeah there not berk's but you get the idea. 
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Originally Posted by texasZ350
thanks for responses. i have the non-revup. I want to do this, but want to make sure i should feel atleast a bit of power upgrade. I know it'll be more when i do the full catback, but point of me doing this earlier, would be to feel how the cats feel without the catback. Just trying to get an idea so i won't get these and feel no power difference and barely any sound change (dont mind sound, cause that'll come with the catback).
WTX - did you feel any power diff with the HFCs?
WTX - did you feel any power diff with the HFCs?
Last edited by WTX350Z; Jan 11, 2008 at 08:37 PM.
Originally Posted by MIA G35
sound clips on the Z fellas! here's a sound clip of FI HFCs on 'ShanesG' on Driver. yeah there not berk's but you get the idea.
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Originally Posted by scmtkings4
damn this sounds pretty good. I still hear that stock growl downlow. I think i lost that with the nismo exhaust
sorry no sound clips.. but it's all good. there is HUGE difference between stock catback and HKS after 3000rpm. different animal.. HKS has way more kranky sound up top like growling V6 and I like that.