Rasp Going Fully Catless? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Rtay0102 · 11-09-2021, 06:19 PM

I was just wondering if anyone would know how raspy my exhaust would be with going fully catless. Right now I have Mxp Comp Rs Catback and Jdl UEL catless headers and i was planning on buying the Berk front pipe.

weederr33 · 11-09-2021, 09:23 PM

Rasp tolerance can be subjective, but the berk catted front pipe will help. Or just leave the oem front pipe. But fully catless will be raspy, and imo, sound like shit.

EndlessAzure · 11-10-2021, 03:57 AM

Really depends on the complete exhaust system and how all the pieces play together.

My exhaust is fully catless without rasp

SydBRZ · 11-10-2021, 06:19 AM

Yes, it will rasp.

You can have additional resonators cut into your pipes at various intervals if a dual resonated front pipe isn't enough. As someone said above, it depends on your tolerance.
You can be chasing resonances for weeks with hot dogs and other additions, if you're fussy enough.

x808drifter · 11-10-2021, 08:45 AM

The extra 2-5 hp isn't worth the noise

spcmafia · 11-10-2021, 08:52 AM

Quote:

Originally Posted by Rtay0102

I was just wondering if anyone would know how raspy my exhaust would be with going fully catless. Right now I have Mxp Comp Rs Catback and Jdl UEL catless headers and i was planning on buying the Berk front pipe.

It is advisable to have at least a High Flow Cat or Resonated Front Pipe, not only because of rasp, but drone. You'll also want to get better exhaust hangers to mitigate some of the drone, but be advised as they seem to be hard to get or take more than a month to get.

kevaughan · 11-10-2021, 09:59 AM

It's going to rasp and sound harsh even from within the cabin and definitely has an unpleasant resonance with the back seats down.

I'm fully catless but the key change for me was a resonated front pipe and the STI exhaust hangers from this thread. I only replaced the last 2 hangers - huge difference.

gen3v8 · 11-10-2021, 11:32 AM

Noisy catless pipes and crackle tunes. pfft

11-09-2021, 06:19 PM	#1
Rtay0102 Junior Member Join Date: Sep 2021 Drives: red 2014 frs Location: Texas Posts: 5 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Rasp Going Fully Catless? I was just wondering if anyone would know how raspy my exhaust would be with going fully catless. Right now I have Mxp Comp Rs Catback and Jdl UEL catless headers and i was planning on buying the Berk front pipe.

11-09-2021, 09:23 PM	#2
weederr33 Airborne at your service Join Date: Sep 2014 Drives: '17 BRZ Series.Yellow Location: El Paso, Texas Posts: 6,420 Thanks: 4,579 Thanked 5,706 Times in 2,992 Posts Mentioned: 33 Post(s) Tagged: 2 Thread(s)	Rasp tolerance can be subjective, but the berk catted front pipe will help. Or just leave the oem front pipe. But fully catless will be raspy, and imo, sound like shit. __________________ Series.Yellowbird - http://www.ft86club.com/forums/showthread.php?t=122135 MS, CSCS, TSAC-F, CPT

11-10-2021, 06:19 AM	#4
SydBRZ Member Join Date: Aug 2020 Drives: MY14 BRZ, MY06 WRX Location: Sydney NSW Posts: 29 Thanks: 9 Thanked 19 Times in 13 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Yes, it will rasp. You can have additional resonators cut into your pipes at various intervals if a dual resonated front pipe isn't enough. As someone said above, it depends on your tolerance. You can be chasing resonances for weeks with hot dogs and other additions, if you're fussy enough. Last edited by SydBRZ; 11-10-2021 at 07:40 AM.

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11-10-2021, 08:45 AM	#5
x808drifter LMGTFY Join Date: Mar 2016 Drives: 13 FRS, 91 Miata Location: Lava Town, HI Posts: 2,776 Thanks: 5,561 Thanked 3,650 Times in 1,625 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	The extra 2-5 hp isn't worth the noise

11-10-2021, 09:59 AM	#7
kevaughan Senior Member Join Date: Nov 2017 Drives: BMW E30, 2014 FR-S Location: Toronto Posts: 134 Thanks: 657 Thanked 43 Times in 34 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	It's going to rasp and sound harsh even from within the cabin and definitely has an unpleasant resonance with the back seats down. I'm fully catless but the key change for me was a resonated front pipe and the STI exhaust hangers from this thread. I only replaced the last 2 hangers - huge difference.

11-10-2021, 11:32 AM	#8
gen3v8 30 minute maintenance Join Date: Oct 2020 Drives: My18 wrxsti Location: Botany Bay Posts: 1,178 Thanks: 769 Thanked 1,236 Times in 631 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	Noisy catless pipes and crackle tunes. pfft

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