Who makes the best HFC's without rasp?

SophiaZ · 02-07-2010, 09:55 PM

Really?!! I just thought it was from loss of back pressure cuz when I put on my S-Tune exhaust, it sounded fine until I put on the Stillen HFC's. I can even hear it when I'm upshifting , not downshifting

radio5boro · 02-07-2010, 10:10 PM

Yeah but the catback has nothing to do with it. The hiss is from the cats because of the lower cell count inside the cat. (as mentioned before)

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02-07-2010, 09:55 PM	#1 (permalink)
SophiaZ A True Z Fanatic Join Date: Dec 2009 Location: South Jersey Posts: 1,463 Drives: 2020 50th anniv 7AT Rep Power: 6733	Really?!! I just thought it was from loss of back pressure cuz when I put on my S-Tune exhaust, it sounded fine until I put on the Stillen HFC's. I can even hear it when I'm upshifting , not downshifting

02-07-2010, 10:10 PM	#2 (permalink)
radio5boro Base Member Join Date: Sep 2009 Location: Queens, NY Posts: 158 Drives: 09 MBlue 370z 6MT Rep Power: 16	Yeah but the catback has nothing to do with it. The hiss is from the cats because of the lower cell count inside the cat. (as mentioned before)