Anyone runs aftermarket header with stock catback? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

stlgrym3 · 10-19-2018, 07:57 AM

I’ve revert my car back to 100% stock except my ACE header and flex fuel kit. I’ve scheduled to remove those next week. But while driving home from the shop yesterday I kind of the sound of ACE header with the stock catback. Has anyone run aftermarket headers with stock catback? Just curious.

Bonburner · 10-19-2018, 08:07 AM

I remember it being a commonly suggested combo if you wanted a quiet system but an aftermarket header.

Since you like it, why not keep it?

Breadman · 10-19-2018, 08:12 AM

yep i run ace and flex with the rest stock

gpvecchi · 10-19-2018, 08:26 AM

Does removing second cat give some power/response?

churchx · 10-19-2018, 08:34 AM

Some. Especially if it's only cat removed. But biggest gains come from catless header+tune, as cat placement in stock header for it to heat up to working temps sooner makes it also more negatively affecting performance. Once one already upgraded header & tune, more gains start to hit diminished returns. Also often many leave 2nd header for emissions purpose instead of going fully catless.

stlgrym3 · 10-19-2018, 08:51 AM

I did my custom tuning while having the catless header plus flex fuel kit and aftermarket catback. Now the catback is back to stock do I need a tune revision?

Also somewhat unrelated, if i remove the flex fuel kit altogether l while keeping the aftermarket header do I need a tune revision?

tobin · 10-19-2018, 10:43 AM

Hey guys with ACE header and stock exhaust...mind posting some video clips for sound?

Irace86.2.0 · 10-19-2018, 05:22 PM

@CSG Mike

He is turbo now, but pretty sure he ran ace with stock catback.

Code Monkey · 10-19-2018, 05:41 PM

The sound of an ACE header with stock catback is nothing special, sounds really close to stock and is almost as quiet as well. I got a little bit more sound with the CSG Touring 86 Competition catback but again, it is not a sophisticated sound.

Lantanafrs2 · 10-19-2018, 05:53 PM

Ofh e85 stock exhaust. Sounds like stock to me. Thank God because road noise is loud enough by itself. Last thing I need is drone.

stlgrym3 · 10-19-2018, 05:56 PM

So it’s perfectly normal to run stock catback with aftermarket header and tunes. That’s great, now my car feels like a sleeper, sounds like stock 86 but has ace header and flex fuel tune.

strat61caster · 10-19-2018, 06:23 PM

+1 It's fine and probably the best power/volume ratio out there.

stlgrym3 · 10-19-2018, 06:43 PM

Question is do I need to have to do a tune revision when I switch back onto stock catback while still running ACE header and flex fuel kit?

Code Monkey · 10-19-2018, 07:06 PM

Not needed.

10-19-2018, 07:57 AM	#1
stlgrym3 Senior Member Join Date: Nov 2011 Drives: 2017 Subaru BRZ Limited Location: socal Posts: 562 Thanks: 72 Thanked 51 Times in 44 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Anyone runs aftermarket header with stock catback? I’ve revert my car back to 100% stock except my ACE header and flex fuel kit. I’ve scheduled to remove those next week. But while driving home from the shop yesterday I kind of the sound of ACE header with the stock catback. Has anyone run aftermarket headers with stock catback? Just curious.

10-19-2018, 05:22 PM	#8
Irace86.2.0 Senior Member Join Date: Mar 2017 Drives: Q5 + BRZ + M796 Location: Santa Rosa, CA Posts: 7,884 Thanks: 5,668 Thanked 5,810 Times in 3,300 Posts Mentioned: 70 Post(s) Tagged: 0 Thread(s)	@CSG Mike He is turbo now, but pretty sure he ran ace with stock catback. __________________ My Build \| K24 Turbo Swap \| K24T BRZ SOLD

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10-19-2018, 08:12 AM	#3
Breadman Senior Member Join Date: Jul 2017 Drives: 2017 BRZ w/PP Location: Pa Posts: 1,027 Thanks: 51 Thanked 302 Times in 225 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	yep i run ace and flex with the rest stock

10-19-2018, 08:26 AM	#4
gpvecchi Senior Member Join Date: Mar 2018 Drives: Toyota 86 GT Limited PP (Model G) Location: Italy Posts: 1,050 Thanks: 411 Thanked 355 Times in 199 Posts Mentioned: 14 Post(s) Tagged: 0 Thread(s)	Does removing second cat give some power/response?

10-19-2018, 08:34 AM	#5
churchx Senior Member Join Date: Mar 2015 Drives: 2014 GT86 Location: Latvia, Riga Posts: 4,335 Thanks: 698 Thanked 2,086 Times in 1,436 Posts Mentioned: 53 Post(s) Tagged: 1 Thread(s)	Some. Especially if it's only cat removed. But biggest gains come from catless header+tune, as cat placement in stock header for it to heat up to working temps sooner makes it also more negatively affecting performance. Once one already upgraded header & tune, more gains start to hit diminished returns. Also often many leave 2nd header for emissions purpose instead of going fully catless.

10-19-2018, 08:51 AM	#6
stlgrym3 Senior Member Join Date: Nov 2011 Drives: 2017 Subaru BRZ Limited Location: socal Posts: 562 Thanks: 72 Thanked 51 Times in 44 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	I did my custom tuning while having the catless header plus flex fuel kit and aftermarket catback. Now the catback is back to stock do I need a tune revision? Also somewhat unrelated, if i remove the flex fuel kit altogether l while keeping the aftermarket header do I need a tune revision?

10-19-2018, 10:43 AM	#7
tobin Senior Member Join Date: Jun 2013 Drives: '13 BRZ Location: CT Posts: 491 Thanks: 322 Thanked 334 Times in 158 Posts Mentioned: 6 Post(s) Tagged: 1 Thread(s)	Hey guys with ACE header and stock exhaust...mind posting some video clips for sound?

10-19-2018, 05:41 PM	#9
Code Monkey Senior Member Join Date: Jul 2016 Drives: Subaru BRZ Location: Atlanta, GA Posts: 879 Thanks: 979 Thanked 597 Times in 355 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	The sound of an ACE header with stock catback is nothing special, sounds really close to stock and is almost as quiet as well. I got a little bit more sound with the CSG Touring 86 Competition catback but again, it is not a sophisticated sound.

10-19-2018, 05:53 PM	#10
Lantanafrs2 Senior Member Join Date: Jan 2018 Drives: 2013 frs red Location: South Florida Posts: 3,576 Thanks: 2,587 Thanked 3,140 Times in 1,689 Posts Mentioned: 6 Post(s) Tagged: 1 Thread(s)	Ofh e85 stock exhaust. Sounds like stock to me. Thank God because road noise is loud enough by itself. Last thing I need is drone.

10-19-2018, 05:56 PM	#11
stlgrym3 Senior Member Join Date: Nov 2011 Drives: 2017 Subaru BRZ Limited Location: socal Posts: 562 Thanks: 72 Thanked 51 Times in 44 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	So it’s perfectly normal to run stock catback with aftermarket header and tunes. That’s great, now my car feels like a sleeper, sounds like stock 86 but has ace header and flex fuel tune.

10-19-2018, 06:43 PM	#13
stlgrym3 Senior Member Join Date: Nov 2011 Drives: 2017 Subaru BRZ Limited Location: socal Posts: 562 Thanks: 72 Thanked 51 Times in 44 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Question is do I need to have to do a tune revision when I switch back onto stock catback while still running ACE header and flex fuel kit?

10-19-2018, 07:06 PM	#14
Code Monkey Senior Member Join Date: Jul 2016 Drives: Subaru BRZ Location: Atlanta, GA Posts: 879 Thanks: 979 Thanked 597 Times in 355 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Not needed.

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