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Will RHFC add rasp to my exhaust system?

I currently have the FI CF cat back with no resonator in the mid pipe, and on cold start up I experience a little bit of rasp that goes away.

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Old 09-03-2012, 12:00 AM   #1 (permalink)
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Default Will RHFC add rasp to my exhaust system?

I currently have the FI CF cat back with no resonator in the mid pipe, and on cold start up I experience a little bit of rasp that goes away. If I add the FI RHFC will this rasp be increased and will I hear it all the time instead of just on cold start.
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Old 09-03-2012, 09:56 AM   #2 (permalink)
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Yes you will. I would look for resonated cats if I were you. It will reduce or eliminate any rasp and keep a clean exhaust note. It will cost more, but it's better to get now than to spend more money later.
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Old 09-03-2012, 01:02 PM   #3 (permalink)
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from what i understand,any hfc or test pipe will add rasp to our cars. no matter what. im also considering buying the FI resonated hfc,for power gains and to add a bit more sound to the exhaust...however i dont want it to sond like a bunch of rasp.

but resonated would be the way to go to help avoid the rasp.
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Old 09-11-2012, 08:33 PM   #4 (permalink)
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RHFC is the only cat pipe that does not cause rasp. the rest do
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Old 09-11-2012, 08:50 PM   #5 (permalink)
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Originally Posted by split View Post
RHFC is the only cat pipe that does not cause rasp. the rest do
well yes, because it is a cat and because it is also resonated...

that being said there was a forum member who has test pipes with a catback and got rasp, he modded his exhaust with helmholtz resonators and now gets a clean exhaust note.
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Old 09-11-2012, 11:47 PM   #6 (permalink)
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Resonated high flow cats will not cause rasp. I've ran them in the past (Fast Intentions) and loved them.
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Old 09-12-2012, 11:12 AM   #7 (permalink)
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Ah, failed to see the "R" in HFC :P What Staples said.
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Old 09-12-2012, 11:49 AM   #8 (permalink)
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So RHFC will further reduce rasp? Also, will they increase volume much?
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Old 09-12-2012, 11:56 AM   #9 (permalink)
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yes deleting your stock cats whether its test pipes, high flow cats, art pipes (resonated test pipes) or resonated high flow cats, will bump the exhaust volume

resonators help a lot with rasp, inline mufflers help even more
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Old 09-12-2012, 12:11 PM   #10 (permalink)
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Me... neanderthal... ugh ugh!!! Me love a little bit of rasp... ugh ugh!! lil rasp sound tough grrrrrunt snarl ugh!!!!

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Old 09-12-2012, 04:10 PM   #11 (permalink)
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Me... neanderthal... ugh ugh!!! Me love a little bit of rasp... ugh ugh!! lil rasp sound tough grrrrrunt snarl ugh!!!!

Stop making fun of me!
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