SCCA Auto-x catalytic convert info - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

series420 · 03-19-2021, 01:50 PM

Hello everyone, Hope you're all having a fine friday. Im here today to ask about catalytic converters and the autocross rules applying to them for the street prepared class. I am simply wondering if I need to run a catalytic converter on both my headers and also the front pipe, or if I can get away with just one or the other.

Thank you all for your shared knowledge.

Enjoy the spring roads, Drive safe!

cjd · 03-19-2021, 01:56 PM

I believe just the front pipe is ok. That certainly has been the case for years in STX and I believe the rule is shared here.

series420 · 03-19-2021, 03:43 PM

Thank you very much for this info

Quote:

Originally Posted by cjd

I believe just the front pipe is ok. That certainly has been the case for years in STX and I believe the rule is shared here.

TeamBadger · 03-19-2021, 03:48 PM

STX requires that you keep one cat

"Any catalytic converters are allowed with the following constraints. Multiple catalytic converters may be replaced by a single unit. The inlet(s) of the replacement converter(s) must be located between the cylinder head and a point 6” (152.4 mm) further along the exhaust flow path from the original exit of the final OE converter."

Street prepared allows for the removal of all cats.

whataboutbob · 03-19-2021, 04:14 PM

Official rules can be found here: https://www.scca.com/downloads/53335...-book/download

series420 · 03-19-2021, 04:47 PM

Quote:

Originally Posted by whataboutbob

Official rules can be found here: https://www.scca.com/downloads/53335...-book/download

Thank you guys

cjd · 03-19-2021, 11:44 PM

Oh well then! I was too lazy to go double check.

racingfool · 03-20-2021, 09:57 AM

What class?

whataboutbob · 03-20-2021, 04:28 PM

Quote:

Originally Posted by racingfool

What class?

It looks like SP from the original post.

racingfool · 07-09-2021, 08:25 PM

No cat required in street prepared.

03-19-2021, 01:50 PM	#1
series420 Member Join Date: Feb 2021 Drives: '13 Toyobaru BRZ Location: MI Posts: 44 Thanks: 31 Thanked 6 Times in 4 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	SCCA Auto-x catalytic convert info Hello everyone, Hope you're all having a fine friday. Im here today to ask about catalytic converters and the autocross rules applying to them for the street prepared class. I am simply wondering if I need to run a catalytic converter on both my headers and also the front pipe, or if I can get away with just one or the other. Thank you all for your shared knowledge. Enjoy the spring roads, Drive safe! __________________ 2013 BRZ Premium Injen short ram intake, OFT Stage2/e85 Ftspeed UEL headers, JDL front/overpipe, HKS high power dual outlet catback

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03-19-2021, 03:48 PM	#4
TeamBadger Member Join Date: Nov 2016 Drives: 2016 Brz Limited Location: Miami, Fl. Posts: 11 Thanks: 2 Thanked 4 Times in 3 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	STX requires that you keep one cat "Any catalytic converters are allowed with the following constraints. Multiple catalytic converters may be replaced by a single unit. The inlet(s) of the replacement converter(s) must be located between the cylinder head and a point 6” (152.4 mm) further along the exhaust flow path from the original exit of the final OE converter." Street prepared allows for the removal of all cats.

03-20-2021, 09:57 AM	#8
racingfool Senior Member Join Date: Feb 2020 Drives: Miata Location: Seattle Posts: 241 Thanks: 86 Thanked 109 Times in 69 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	What class?

07-09-2021, 08:25 PM	#10
racingfool Senior Member Join Date: Feb 2020 Drives: Miata Location: Seattle Posts: 241 Thanks: 86 Thanked 109 Times in 69 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	No cat required in street prepared.

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