Hissing/Rattling noice after HFC

Zedhead585 · 07-16-2018, 02:17 PM

Hey guys been doing a ton of research on this noise ive been getting right after i installed my Berk High flow cats. Ive seen that multiple people have had this issue and have found different ways to make it better. Not FIX it. Sence these threads were from minimal 4 years prior to now i thought id post a thread incase anyone has found a solution. Very irratting after buying a brand new ark grip CBE and Berk HFC’s just for it to sound broken to the average joe. Any help or suggestions are greatly appericated! Thanks!

littlejuanito · 07-16-2018, 02:26 PM

The hiss is common on these VQ37 engines, especially with HFC installed. You just gonna have to get used to it or put your catalytic converter back on.

Whjaxn17 · 07-19-2018, 08:37 AM

Yup, part of it. You can get a resonated CBE like the FI and it will help, but

. You're pretty well going to have to deal or put the stock cats back on.

Chuck33079 · 07-19-2018, 08:41 AM

It's not fixable since that's what the motor sounds like. Either muffle it with a more restrictive exhaust option, or learn to love it.

Quicksilvers · 07-20-2018, 03:25 AM

When opting for HFC’s that is what our VQ37 engines sound like. I would learn to like it and turn your stereo up and listen to that instead or change to a different muffler.

iidylii · 07-23-2018, 10:02 AM

Yep same problem here of course...you now know how much noise reduction stock cats provide...stock cats back on if u want the noise gone

07-16-2018, 02:17 PM	#1 (permalink)
Zedhead585 Base Member Join Date: Apr 2018 Location: Rochester Posts: 10 Drives: 15 Nissan 370z SR Rep Power: 7	Hissing/Rattling noice after HFC Hey guys been doing a ton of research on this noise ive been getting right after i installed my Berk High flow cats. Ive seen that multiple people have had this issue and have found different ways to make it better. Not FIX it. Sence these threads were from minimal 4 years prior to now i thought id post a thread incase anyone has found a solution. Very irratting after buying a brand new ark grip CBE and Berk HFC’s just for it to sound broken to the average joe. Any help or suggestions are greatly appericated! Thanks!

07-16-2018, 02:26 PM	#2 (permalink)
littlejuanito Track Member Join Date: Jul 2014 Location: Sherman Oaks, CA Posts: 812 Drives: 2014 Touring Sport Rep Power: 418	The hiss is common on these VQ37 engines, especially with HFC installed. You just gonna have to get used to it or put your catalytic converter back on. JLarson likes this.

07-19-2018, 08:37 AM	#3 (permalink)
Whjaxn17 Enthusiast Member Join Date: Sep 2015 Location: Alabama Age: 28 Posts: 420 Drives: 17 370Z 6MT Rep Power: 3364	Yup, part of it. You can get a resonated CBE like the FI and it will help, but . You're pretty well going to have to deal or put the stock cats back on. Chuck33079 likes this. __________________ 377whp/299wtq NA 704whp/519wtq, SOHO stage 2.5 IG: pearlywhite.z

07-19-2018, 08:41 AM	#4 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29538	It's not fixable since that's what the motor sounds like. Either muffle it with a more restrictive exhaust option, or learn to love it. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

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07-20-2018, 03:25 AM	#5 (permalink)
Quicksilvers A True Z Fanatic Join Date: May 2017 Location: Atlanta, GA Posts: 2,039 Drives: 2017 370z Rep Power: 25462	When opting for HFC’s that is what our VQ37 engines sound like. I would learn to like it and turn your stereo up and listen to that instead or change to a different muffler.

07-23-2018, 10:02 AM	#6 (permalink)
iidylii Base Member Join Date: Dec 2015 Location: Minnesota Posts: 38 Drives: 2014 370z nismo Rep Power: 9	Yep same problem here of course...you now know how much noise reduction stock cats provide...stock cats back on if u want the noise gone