FI Automatic Exhaust Questions - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

James Russels · 03-07-2019, 02:33 AM

Hi all, I am planning on getting the JDL turbo kit with recirculated wastegate, and want to ensure I have plenty of exhaust diameter to support it. My plan was to get a 3" overpipe and frontpipe, then a 2.5" catback, assuming that wouldn't be a bottleneck for my 300whp goal.

I was looking at getting the JDL OP/FP combo, but the site says the 3" option won't fit with an automatic transmission.

My questions are:

-Am I out of luck for a 3" OP/FP with AT? It seems there are very limited 3" options - the only other one I could find was the nameless overpipe and frontpipe combo, but that also supposedly won't work with AT.

-Is 3" even necessary for this setup? Based on what I've found online, it looks like a 2.75"-3.00" diameter is recommended for that power goal, and I figured it'd be better to go larger due to the recirculated wastegate and catted FP.

Any help is appreciated. Thanks in advance.

Joveen · 03-07-2019, 11:42 AM

Maybe the nameless 3" can fit or get it on custom made.

Sent from my SM-N960U using Tapatalk

Dr. BRZ · 03-07-2019, 07:17 PM

I will answer all your questions, CUSTOM PIPES.

maplemylife · 03-07-2019, 08:07 PM

2.5 is fp/op is good enough unless you're aiming for 450whp+ the biggest bottleneck are the catalytic converters.. also if you go 3" fp op you will have metal on metal contact due to rough fitment causing false knock.. my setup is 2.5 fp op into 3 inch cat back has no issues

CSG Mike · 03-07-2019, 08:27 PM

I hit 360whp on a stock exhaust with stock diameter piping all the way back, with a stock front pipe.

I don't think you need to worry!

DarkPira7e · 03-07-2019, 10:13 PM

If you want to be sure you hit the goal, ditch the standard pte and go with the upgraded Garrett turbo options.

Edit:: 86speed has a sale right now on the UEL kit with the 2860rs, you'll have no problem getting 300whp with this setup. Comes recirc, too. https://www.86speed.com/jdl-turbo-kit-2860rs-spec-kit

James Russels · 03-16-2019, 03:13 PM

Thanks for the replies, everyone. After additional research, I decided to go with the Tanabe 2.5" OP and JDL 2.5" ultra-quiet FP.

Quote:

Originally Posted by DarkPira7e

If you want to be sure you hit the goal, ditch the standard pte and go with the upgraded Garrett turbo options.

Edit:: 86speed has a sale right now on the UEL kit with the 2860rs, you'll have no problem getting 300whp with this setup. Comes recirc, too. https://www.86speed.com/jdl-turbo-kit-2860rs-spec-kit

Was already planning on getting the GTX2860R Gen II.

Unfortunately I'd like EL headers so not sure that sale will be an option, but I'll reach out to JDL.

03-07-2019, 02:33 AM	#1
James Russels Member Join Date: Sep 2015 Drives: 2013 FRS Location: Chicago, IL Posts: 59 Thanks: 5 Thanked 5 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	FI Automatic Exhaust Questions Hi all, I am planning on getting the JDL turbo kit with recirculated wastegate, and want to ensure I have plenty of exhaust diameter to support it. My plan was to get a 3" overpipe and frontpipe, then a 2.5" catback, assuming that wouldn't be a bottleneck for my 300whp goal. I was looking at getting the JDL OP/FP combo, but the site says the 3" option won't fit with an automatic transmission. My questions are: -Am I out of luck for a 3" OP/FP with AT? It seems there are very limited 3" options - the only other one I could find was the nameless overpipe and frontpipe combo, but that also supposedly won't work with AT. -Is 3" even necessary for this setup? Based on what I've found online, it looks like a 2.75"-3.00" diameter is recommended for that power goal, and I figured it'd be better to go larger due to the recirculated wastegate and catted FP. Any help is appreciated. Thanks in advance.

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03-07-2019, 11:42 AM	#2
Joveen Senior Member Join Date: Mar 2018 Drives: Bone stock Location: Windsor, CT Posts: 776 Thanks: 535 Thanked 234 Times in 164 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Maybe the nameless 3" can fit or get it on custom made. Sent from my SM-N960U using Tapatalk

03-07-2019, 08:07 PM	#4
maplemylife Member Join Date: Nov 2017 Drives: FRS Location: FL Posts: 15 Thanks: 0 Thanked 4 Times in 4 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	2.5 is fp/op is good enough unless you're aiming for 450whp+ the biggest bottleneck are the catalytic converters.. also if you go 3" fp op you will have metal on metal contact due to rough fitment causing false knock.. my setup is 2.5 fp op into 3 inch cat back has no issues

03-07-2019, 08:27 PM	#5
CSG Mike Join Date: Jul 2012 Drives: S2000 CR Location: Orange County Posts: 14,561 Thanks: 8,941 Thanked 14,211 Times in 6,854 Posts Mentioned: 970 Post(s) Tagged: 14 Thread(s)	I hit 360whp on a stock exhaust with stock diameter piping all the way back, with a stock front pipe. I don't think you need to worry!

03-07-2019, 10:13 PM	#6
DarkPira7e Rust bucket enthusiast Join Date: Feb 2017 Drives: 2013 Turbo Firestorm FRS Location: Vermont Posts: 4,024 Thanks: 3,289 Thanked 4,177 Times in 2,098 Posts Mentioned: 33 Post(s) Tagged: 0 Thread(s)	If you want to be sure you hit the goal, ditch the standard pte and go with the upgraded Garrett turbo options. Edit:: 86speed has a sale right now on the UEL kit with the 2860rs, you'll have no problem getting 300whp with this setup. Comes recirc, too. https://www.86speed.com/jdl-turbo-kit-2860rs-spec-kit

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