Will RHFC add rasp to my exhaust system?

supadice · 09-03-2012, 12:00 AM

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.

SS_Firehawk · 09-03-2012, 09:56 AM

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.

KB2 · 09-03-2012, 01:02 PM

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.

split · 09-11-2012, 08:33 PM

RHFC is the only cat pipe that does not cause rasp. the rest do

370Z Purist · 09-11-2012, 08:50 PM

Quote:

Originally Posted by split

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.

Staples · 09-11-2012, 11:47 PM

Resonated high flow cats will not cause rasp. I've ran them in the past (Fast Intentions) and loved them.

SS_Firehawk · 09-12-2012, 11:12 AM

Ah, failed to see the "R" in HFC :P What Staples said.

DarkJak · 09-12-2012, 11:49 AM

So RHFC will further reduce rasp? Also, will they increase volume much?

Sales@AAMComp · 09-12-2012, 11:56 AM

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

UNKNOWN_370 · 09-12-2012, 12:11 PM

Me... neanderthal... ugh ugh!!! Me love a little bit of rasp... ugh ugh!! lil rasp sound tough grrrrrunt snarl ugh!!!!

370Z Purist · 09-12-2012, 04:10 PM

Quote:

Originally Posted by UNKNOWN_370

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!

09-03-2012, 12:00 AM	#1 (permalink)
supadice Base Member Join Date: Aug 2012 Location: NY Posts: 2 Drives: Nissan 370z Rep Power: 14	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.

09-03-2012, 09:56 AM	#2 (permalink)
SS_Firehawk A True Z Fanatic Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7336	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. __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction

09-11-2012, 11:47 PM	#6 (permalink)
Staples Track Member Join Date: Sep 2010 Location: Baltimore, MD Posts: 546 Drives: '08 Infiniti G37s Rep Power: 17	Resonated high flow cats will not cause rasp. I've ran them in the past (Fast Intentions) and loved them. __________________ '08 Infiniti G37s - Forced Induction Fed

09-12-2012, 11:12 AM	#7 (permalink)
SS_Firehawk A True Z Fanatic Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7336	Ah, failed to see the "R" in HFC :P What Staples said. __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction

09-12-2012, 11:56 AM	#9 (permalink)
Sales@AAMComp A True Z Fanatic Join Date: Jul 2012 Location: Annapolis Junction, MD Posts: 4,079 Drives: GT-R Rep Power: 22	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 __________________ Tyler Day, Technical Sales TylerD@aamcompetition.com 301-497-9214 Direct AAM Competition \| YouTube channel \| LIKE us on Facebook!

09-03-2012, 01:02 PM	#3 (permalink)
KB2 Base Member Join Date: Apr 2010 Location: Illinois Posts: 243 Drives: 370z Rep Power: 17	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.

09-11-2012, 08:33 PM	#4 (permalink)
split Base Member Join Date: Feb 2010 Location: Edmonton, AB, CA Posts: 17 Drives: 08 Porsche Cayenne Rep Power: 17	RHFC is the only cat pipe that does not cause rasp. the rest do

09-12-2012, 11:49 AM	#8 (permalink)
DarkJak A True Z Fanatic Join Date: Jun 2011 Location: Madison, WI Posts: 1,397 Drives: 2009 370Z Rep Power: 16805	So RHFC will further reduce rasp? Also, will they increase volume much?

09-12-2012, 12:11 PM	#10 (permalink)
UNKNOWN_370 A True Z Fanatic Join Date: Jul 2009 Location: ny'r livn in tx Posts: 8,687 Drives: well over 130m.p.h. Rep Power: 14859	Me... neanderthal... ugh ugh!!! Me love a little bit of rasp... ugh ugh!! lil rasp sound tough grrrrrunt snarl ugh!!!!

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Rasp...coming from what part of my 370Z's exhaust?	marcussoori	Intake/Exhaust	18	12-12-2020 10:14 PM
Berk HFCs on Factory Nismo Exhaust RASP	QVu	Nismo 370Z	99	12-02-2014 08:49 AM
New INVIDIA exhaust dual canister NO RASP. PROTOTYPE AVAILABLE SOON FROM AMPLIFIED	LOU@AMPLIFIED	Intake/Exhaust	177	10-12-2011 04:01 PM
ARK PERFORMANCE USA dot COM : 370Z/Z34/VQ37 GRIP EXHAUST SYSTEM FULL CATBACK SYSTEM	TeamARK	Intake/Exhaust	25	09-01-2011 11:27 AM
Rasp on exhaust where does it come from..	CATCHINZZZS	Intake/Exhaust	5	04-15-2011 11:26 PM