super noobie question - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

bzdont · 07-11-2017, 06:18 PM

Can someone explain difference between a "catted" and "catless" header?
Doesn't the catalytic converter (and the rest of the exhaust) come sequentially AFTER the exhaust header?? If so, what does it mean to have a catless header?

Is the stock header catted or catless?

And speaking of which, are most (all?) of the 3rd party EL and UEL headers talked about here catted or catless? For example, Borla, JDL, OpenFlash, etc.

Ignorance is not bliss in this case!
Thx.

swarb · 07-11-2017, 06:21 PM

Quote:

Originally Posted by bzdont

Can someone explain difference between a "catted" and "catless" header?
Doesn't the catalytic converter (and the rest of the exhaust) come sequentially AFTER the exhaust header?? If so, what does it mean to have a catless header?

Is the stock header catted or catless?

And speaking of which, are most (all?) of the 3rd party EL and UEL headers talked about here catted or catless? For example, Borla, JDL, OpenFlash, etc.

Ignorance is not bliss in this case!
Thx.

There are two cats. One in the header, one in the front pipe.
Stock is catted. Most aftermarket are catless.

humfrz · 07-11-2017, 09:13 PM

Quote:

Originally Posted by bzdont

Can someone explain difference between a "catted" and "catless" header?
Doesn't the catalytic converter (and the rest of the exhaust) come sequentially AFTER the exhaust header?? If so, what does it mean to have a catless header?

Is the stock header catted or catless?

And speaking of which, are most (all?) of the 3rd party EL and UEL headers talked about here catted or catless? For example, Borla, JDL, OpenFlash, etc.

Ignorance is not bliss in this case!
Thx.

To help with the above explanation and diagram.

The OEM header has a cat built on at the end of it. So, it's "catted".

(the fat part in the picture below is the cat.)

humfrz

bzdont · 07-12-2017, 09:28 AM

Thanks, very helpful.

8RZ · 07-12-2017, 09:47 AM

JD001 · 07-12-2017, 09:55 AM

I was expecting a 'super noobie' question like:

1. How to check the oil level using OEM dipstick?
2. What are the little square tiles on my wheels?
3. How to install a sunroof or chop the roof?

humfrz · 07-12-2017, 12:57 PM

Quote:

Originally Posted by JD001

I was expecting a 'super noobie' question like:

1. How to check the oil level using OEM dipstick?
2. What are the little square tiles on my wheels?
3. How to install a sunroof or chop the roof?

Yaaaa!......let's bring back that mod ........

humfrz

07-11-2017, 06:18 PM	#1
bzdont Member Join Date: May 2012 Drives: 2014 BRZ Limited SWP Location: Philadelphia PA Posts: 23 Thanks: 0 Thanked 8 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	super noobie question Can someone explain difference between a "catted" and "catless" header? Doesn't the catalytic converter (and the rest of the exhaust) come sequentially AFTER the exhaust header?? If so, what does it mean to have a catless header? Is the stock header catted or catless? And speaking of which, are most (all?) of the 3rd party EL and UEL headers talked about here catted or catless? For example, Borla, JDL, OpenFlash, etc. Ignorance is not bliss in this case! Thx.

07-12-2017, 09:55 AM	#6
JD001 Senior Member Join Date: Apr 2015 Drives: Subaru BRZ Location: UK Posts: 6,262 Thanks: 7,981 Thanked 6,501 Times in 3,639 Posts Mentioned: 26 Post(s) Tagged: 2 Thread(s)	I was expecting a 'super noobie' question like: 1. How to check the oil level using OEM dipstick? 2. What are the little square tiles on my wheels? 3. How to install a sunroof or chop the roof? Last edited by JD001; 07-12-2017 at 10:15 AM.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Noobie injector install question	DAN_BRZ	Engine, Exhaust, Transmission	0	04-15-2015 12:36 PM
Super duper quick question!	einrejosh	Software Tuning	4	03-21-2015 09:21 AM
Noobie question. Ecutek and brz edit	Bongertz	Software Tuning	4	09-17-2014 01:04 AM
OFT noobie question	cuddefred	Software Tuning	12	08-14-2014 07:17 AM
FR-S Noobie Q's	steve87j	Scion FR-S / Toyota 86 GT86 General Forum	23	01-05-2013 10:24 AM

07-12-2017, 09:28 AM	#4
bzdont Member Join Date: May 2012 Drives: 2014 BRZ Limited SWP Location: Philadelphia PA Posts: 23 Thanks: 0 Thanked 8 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Thanks, very helpful.

User Name		Remember Me?
Password