Benefits of a high flow cat? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Thet · 03-22-2015, 08:29 AM

Hey all, I am considering to buy a high flow cat.
What are the benefits? Worth the $ ?

YangerD · 03-22-2015, 08:36 AM

Hi flow cats like the name implies, flows better which will give you more power. It will also be louder. Worth the money is subjective and up to the individual.

raven1231 · 03-22-2015, 09:01 AM

Are you on stock exhaust? And yes as the person above me said it just allows for better air flow and will pick up a marginal amount of hp. A test pipe will be even louder, smell worse due to lack of cat, trigger a cel without a tune, and pick up a few more hp.

Thet · 03-22-2015, 09:03 AM

Quote:

Originally Posted by raven1231

Are you on stock exhaust? And yes as the person above me said it just allows for better air flow and will pick up a marginal amount of hp. A test pipe will be even louder, smell worse due to lack of cat, trigger a cel without a tune, and pick up a few more hp.

Yes stock at this stage

RobertPaulson · 03-22-2015, 09:24 AM

Quote:

Originally Posted by raven1231

Are you on stock exhaust? And yes as the person above me said it just allows for better air flow and will pick up a marginal amount of hp. A test pipe will be even louder, smell worse due to lack of cat, trigger a cel without a tune, and pick up a few more hp.

this is actually not true in regards to the cat in the front pipe. removing the second cat will not trigger a CEL because there is no o2 sensor attached to it.

source: i haven't had a second cat for 15k miles.

raven1231 · 03-22-2015, 09:27 AM

Quote:

Originally Posted by RobertPaulson

this is actually not true in regards to the cat in the front pipe. removing the second cat will not trigger a CEL because there is no o2 sensor attached to it.

source: i haven't had a second cat for 15k miles.

I stand corrected. I was thinking of the header. Guess I never really paid attention to it since I had the OFT as my first mod so with a tune I never triggered a light.

RobertPaulson · 03-22-2015, 09:37 AM

Quote:

Originally Posted by raven1231

I stand corrected. I was thinking of the header. Guess I never really paid attention to it since I had the OFT as my first mod so with a tune I never triggered a light.

ah yes, removing the cat in the header will eventually trigger a cel unless you get tuned (which you should).

to the OP, if you aren't planning to replace the header, just get a catless and resonated front pipe with whatever catback you get. if you plan to get a catless header, getting a catted front pipe might be best to avoid having a smelly car and keep the rasp and drone down.

tyler_win_photo · 03-23-2015, 04:37 PM

Almost nothing on this car will yield decent gains besides maybe crawford power blocks without a tune. If you're looking for power skip the front pipe for now, get catless headers + tune, then work your way backwards (front pipe, then catback).

kmbkk · 03-24-2015, 08:08 AM

I'm actually considering getting a high flow cat for my car as well. I'm running a 3" TBE, header and no cats. I'm looking to quieten down the exhaust note and was thinking one would help.

03-22-2015, 08:29 AM	#1
Thet Member Join Date: Mar 2015 Drives: Blue Location: Ny Posts: 17 Thanks: 0 Thanked 2 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Benefits of a high flow cat? Hey all, I am considering to buy a high flow cat. What are the benefits? Worth the $ ?

03-22-2015, 09:01 AM	#3
raven1231 Senior Member Join Date: Aug 2013 Drives: 2013 Firestorm FR-S, 2016 DGM WRX Location: Cincinnati, Ohio Posts: 4,580 Thanks: 8,264 Thanked 3,118 Times in 1,667 Posts Mentioned: 24 Post(s) Tagged: 1 Thread(s)	Are you on stock exhaust? And yes as the person above me said it just allows for better air flow and will pick up a marginal amount of hp. A test pipe will be even louder, smell worse due to lack of cat, trigger a cel without a tune, and pick up a few more hp. __________________ http://www.ft86club.com/forums/showthread.php?t=59870

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03-22-2015, 08:36 AM	#2
YangerD Senior Member Join Date: Feb 2012 Drives: 2017 Toyota 86 Location: Toronto Posts: 187 Thanks: 159 Thanked 55 Times in 48 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Hi flow cats like the name implies, flows better which will give you more power. It will also be louder. Worth the money is subjective and up to the individual.

03-23-2015, 04:37 PM	#8
tyler_win_photo Senior Member Join Date: Dec 2013 Drives: 2014 Scion FRS (Asphalt) Location: Redmond, WA Posts: 557 Thanks: 39 Thanked 172 Times in 142 Posts Mentioned: 6 Post(s) Tagged: 2 Thread(s)	Almost nothing on this car will yield decent gains besides maybe crawford power blocks without a tune. If you're looking for power skip the front pipe for now, get catless headers + tune, then work your way backwards (front pipe, then catback).

03-24-2015, 08:08 AM	#9
kmbkk First 86 Driver Baby! Join Date: Jan 2012 Drives: FR-S, Flex Location: Williamsburg, VA Posts: 1,752 Thanks: 509 Thanked 513 Times in 349 Posts Mentioned: 32 Post(s) Tagged: 3 Thread(s)	I'm actually considering getting a high flow cat for my car as well. I'm running a 3" TBE, header and no cats. I'm looking to quieten down the exhaust note and was thinking one would help.

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