Double Cat Front Pipe? Emissions? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

swift996 · 01-13-2014, 06:33 PM

Had a friend with a FRS recently fail an emissions check (cat-less header and open exhaust). I was wondering if you took two OEM front pipes, cut them and welded on both secondary cats if that would be enough to clean up the exhaust? Thoughts? Or does someone make a super restrictive cat-converter?

mrk1 · 01-13-2014, 06:57 PM

Well first off how did he fail? Visual? OBD? Tail pipe sniffer?

swift996 · 01-13-2014, 07:50 PM

Quote:

Originally Posted by mrk1

Well first off how did he fail? Visual? OBD? Tail pipe sniffer?

It sounded like the last, the device that reads whats coming out of the tail pipe.

ciro · 01-13-2014, 08:00 PM

just get 2 high flow cats if your concerned....

JS + BRZ · 01-13-2014, 08:00 PM

Why did your friend go get it checked with cat-less header and open exhaust?

Basket Case · 01-13-2014, 08:19 PM

Quote:

Originally Posted by JS + MS3

Why did your friend go get it checked with cat-less header and open exhaust?

Lol, this. I would just get a high flow cat welded in. I don't see why one wouldn't be enough.

NickFRS · 01-13-2014, 08:36 PM

Simple... Put stock back on and roll back through...

mrk1 · 01-13-2014, 08:41 PM

Yeah if your area has a sniffer your best bet is to put stock stuff back on. I've never lived in an area that requires that.

You double cat idea "could" work but its still a shot in the dark.

FR-S Matt · 01-13-2014, 09:25 PM

One cat should get you past the sniffer. They don't have it where I am, yet.

swift996 · 01-13-2014, 09:29 PM

Just curious because the front pipe is only 4 bolts so it could be a simple swap on/swap off job once every year or how often they test. The intent is to pass the test

01-13-2014, 06:33 PM	#1
swift996 Senior Member Join Date: Nov 2011 Drives: Subaru BRZ Limited 6MT Location: Winston-Salem, NC Posts: 2,432 Thanks: 712 Thanked 954 Times in 545 Posts Mentioned: 47 Post(s) Tagged: 0 Thread(s)	Double Cat Front Pipe? Emissions? Had a friend with a FRS recently fail an emissions check (cat-less header and open exhaust). I was wondering if you took two OEM front pipes, cut them and welded on both secondary cats if that would be enough to clean up the exhaust? Thoughts? Or does someone make a super restrictive cat-converter? __________________ Innovate Supercharged Black Limited BRZ 6-Speed MT(Build Thread) 2010 Cadillac CTS-V Sedan M6 w/550whp (Build Thread)

01-13-2014, 06:57 PM	#2
mrk1 Senior Member Join Date: Mar 2013 Drives: Sterling BRZ Ltd Location: New England Posts: 1,702 Thanks: 403 Thanked 1,389 Times in 671 Posts Mentioned: 20 Post(s) Tagged: 2 Thread(s)	Well first off how did he fail? Visual? OBD? Tail pipe sniffer? __________________ The Build Thread GT28RS - eBoost2 - 3.91 Final Drive - Supra LSD

01-13-2014, 08:36 PM	#7
NickFRS Senior Member Join Date: Jun 2012 Drives: 2013 Asphalt FRS Location: Gladstone Posts: 1,450 Thanks: 899 Thanked 440 Times in 286 Posts Mentioned: 75 Post(s) Tagged: 0 Thread(s)	Simple... Put stock back on and roll back through... __________________ 2013 Sion FRS 2014 Subaru WRX 2014 Subaru XV

01-13-2014, 08:41 PM	#8
mrk1 Senior Member Join Date: Mar 2013 Drives: Sterling BRZ Ltd Location: New England Posts: 1,702 Thanks: 403 Thanked 1,389 Times in 671 Posts Mentioned: 20 Post(s) Tagged: 2 Thread(s)	Yeah if your area has a sniffer your best bet is to put stock stuff back on. I've never lived in an area that requires that. You double cat idea "could" work but its still a shot in the dark. __________________ The Build Thread GT28RS - eBoost2 - 3.91 Final Drive - Supra LSD

01-13-2014, 09:29 PM	#10
swift996 Senior Member Join Date: Nov 2011 Drives: Subaru BRZ Limited 6MT Location: Winston-Salem, NC Posts: 2,432 Thanks: 712 Thanked 954 Times in 545 Posts Mentioned: 47 Post(s) Tagged: 0 Thread(s)	Just curious because the front pipe is only 4 bolts so it could be a simple swap on/swap off job once every year or how often they test. The intent is to pass the test __________________ Innovate Supercharged Black Limited BRZ 6-Speed MT(Build Thread) 2010 Cadillac CTS-V Sedan M6 w/550whp (Build Thread)

01-13-2014, 08:00 PM	#4
ciro Senior Member Join Date: Jun 2013 Drives: Scion FR-S Location: minnesota Posts: 240 Thanks: 61 Thanked 84 Times in 49 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	just get 2 high flow cats if your concerned....

01-13-2014, 08:00 PM	#5
JS + BRZ Banned Join Date: Dec 2013 Drives: 2010 MS3 Location: Los Angeles Posts: 1,820 Thanks: 1,180 Thanked 1,161 Times in 597 Posts Mentioned: 18 Post(s) Tagged: 0 Thread(s)	Why did your friend go get it checked with cat-less header and open exhaust?

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