Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - Gutted cat stock header vs aftermarket catless header NA application

stevo585 · 04-03-2014, 04:24 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?

04-03-2014, 04:24 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?