Gutted cat stock header vs aftermarket catless header NA application - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

stevo585 · 04-03-2014, 05:24 PM

Has anyone verified there is gains with aftermarket? The only thread I've seen is with a innovate SC kit and the stock gutted header was equal to the aftermarket header.

This has got me thinking the stock headers are probably a good design and the hp/tq gains come mostly from not having a cat?

I know in theory you should gain some more from runner length optimization, etc. but any real evidence?

Craig · 04-03-2014, 08:00 PM

Think the evidence is in the variation in aftermarket headers gains. There may be some hp lost by the stock cat, but the reality is there's much more left on the table from optimizing the design.

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bfrank1972 · 04-03-2014, 08:14 PM

Curious about this as well, with the current demand for aftermarket headers, there's bound to be a surplus of OEM headers floating around out there. Interested in what a set of 'optimized' stock headers could do...

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Turdinator · 04-03-2014, 09:25 PM

There is a one make race series in NZ where they remove the CAT and replace it with a nicer collector but i think the real advantage comes from being able to run a more aggressive tune.

stevo585 · 04-03-2014, 10:23 PM

Quote:

Originally Posted by Turdinator

There is a one make race series in NZ where they remove the CAT and replace it with a nicer collector but i think the real advantage comes from being able to run a more aggressive tune.

I agree 100%. The extra power comes from the tune and lack of a cat much more than the header design. Since the stock header is a good design t begin with. Someone prove me wrong.

Gilwith1l · 04-03-2014, 10:29 PM

Wow I just got flamed for asking the same thing . its my understanding its about 5hp diff

Gilwith1l · 04-03-2014, 10:32 PM

Ignore my last post . I'm a dumbass

Reaper · 04-04-2014, 04:58 PM

Quote:

Originally Posted by stevo585

I agree 100%. The extra power comes from the tune and lack of a cat much more than the header design. Since the stock header is a good design t begin with. Someone prove me wrong.

local shop near me cut out the cat in the header on his car used a full exhaust and put it on E85 and passed 200WHP with no issues.

stevo585 · 04-04-2014, 05:12 PM

I'm to try the same thing before I buy a header.

04-03-2014, 05:24 PM	#1
stevo585 Senior Member Join Date: Feb 2014 Drives: White 2014 BRZ Location: Orlando, FL. Posts: 519 Thanks: 131 Thanked 155 Times in 109 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Gutted cat stock header vs aftermarket catless header NA application Has anyone verified there is gains with aftermarket? The only thread I've seen is with a innovate SC kit and the stock gutted header was equal to the aftermarket header. This has got me thinking the stock headers are probably a good design and the hp/tq gains come mostly from not having a cat? I know in theory you should gain some more from runner length optimization, etc. but any real evidence?

04-03-2014, 08:00 PM	#2
Craig Senior Member Join Date: Jul 2012 Drives: Asphalt FRS Location: Central New Jersey Posts: 338 Thanks: 242 Thanked 191 Times in 66 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Think the evidence is in the variation in aftermarket headers gains. There may be some hp lost by the stock cat, but the reality is there's much more left on the table from optimizing the design. Sent from my iPhone using Tapatalk __________________ Current: Nameless Headerback- Crawford BPB - Zeta Intake Duct - Mishimoto Intake

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04-03-2014, 08:14 PM	#3
bfrank1972 Senior Member Join Date: Jul 2013 Drives: 2013 FR-S Argento Location: Westport,CT Posts: 1,855 Thanks: 517 Thanked 1,039 Times in 616 Posts Mentioned: 7 Post(s) Tagged: 1 Thread(s)	Curious about this as well, with the current demand for aftermarket headers, there's bound to be a surplus of OEM headers floating around out there. Interested in what a set of 'optimized' stock headers could do... Sent from my QMV7A using Tapatalk

04-03-2014, 10:29 PM	#6
Gilwith1l Senior Member Join Date: Jan 2014 Drives: stock brz. saving my money for ls1 Location: central Jersey Posts: 129 Thanks: 91 Thanked 34 Times in 21 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Wow I just got flamed for asking the same thing . its my understanding its about 5hp diff

04-03-2014, 10:32 PM	#7
Gilwith1l Senior Member Join Date: Jan 2014 Drives: stock brz. saving my money for ls1 Location: central Jersey Posts: 129 Thanks: 91 Thanked 34 Times in 21 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Ignore my last post . I'm a dumbass

04-04-2014, 05:12 PM	#9
stevo585 Senior Member Join Date: Feb 2014 Drives: White 2014 BRZ Location: Orlando, FL. Posts: 519 Thanks: 131 Thanked 155 Times in 109 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	I'm to try the same thing before I buy a header.

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