Question for guys running 3" catback exhaust - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

chazmuska · 10-31-2019, 06:54 PM

Hey guys, I still have a small exhaust leak from where my front pipe meets the mid-pipe/catback. My catback is a 3" from Perrin and my front pipe is a 2.5" from Invidia. I'm getting a slight exhaust leak where those two meet and I don't think I can use the stock donut gasket because its meant for a 2.5" stock exhaust. Has anyone had leaks in that area?...if so what type of gasket would you recommend? A guy from Brakes Plus said he recommended a thick 2.5 flange gasket (5-8mm)....does this sound reasonable? Any tips would help, thanks guys!

86MLR · 10-31-2019, 07:03 PM

Maybe this, maybe?

https://www.mishimoto.com.au/subaru-...caAjNwEALw_wcB

I'm sure you could find one cheaper if you googled for more than 3 seconds.

chazmuska · 10-31-2019, 08:18 PM

Quote:

Originally Posted by 86MLR

Maybe this, maybe?

https://www.mishimoto.com.au/subaru-...caAjNwEALw_wcB

I'm sure you could find one cheaper if you googled for more than 3 seconds.

Nice, I didn't even know they made a conversion piece!

Joveen · 10-31-2019, 09:16 PM

GrimmSpeed makes a cheaper one I think. I haven't bought mine yet tho lol.

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fika84 · 11-01-2019, 10:53 AM

Or you run 3" all the way and call it a day!

Grady · 11-01-2019, 05:19 PM

Quote:

Originally Posted by fika84

Or you run 3" all the way and call it a day!

Exactly!

Try Again · 01-06-2020, 11:41 PM

Use permatex copper gasket maker. Works like a charm

Joveen · 01-07-2020, 12:17 AM

Quote:

Originally Posted by Try Again

Use permatex copper gasket maker. Works like a charm

This!! Been using that since day one that's why I havent bought the part from GrimmSpeed.

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Ignore Your Doctor · 01-07-2020, 10:40 AM

I bought the grimmspeed 2.5" to 3" adapter and it fixed this issue on mine perfectly. Im actually switching to a full 3" header back so I would give you mine cheap if youre interested.

chazmuska · 05-20-2020, 11:55 PM

Quote:

Originally Posted by Ignore Your Doctor

I bought the grimmspeed 2.5" to 3" adapter and it fixed this issue on mine perfectly. Im actually switching to a full 3" header back so I would give you mine cheap if youre interested.

Hey I never saw this. Do you still have the 2.5" to 3" adapter?

Ignore Your Doctor · 05-22-2020, 03:20 PM

sorry I just got rid of it last week

10-31-2019, 06:54 PM	#1
chazmuska Member Join Date: Dec 2016 Drives: 2014 Scion FR-S Location: Arizona Posts: 80 Thanks: 19 Thanked 21 Times in 12 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Question for guys running 3" catback exhaust Hey guys, I still have a small exhaust leak from where my front pipe meets the mid-pipe/catback. My catback is a 3" from Perrin and my front pipe is a 2.5" from Invidia. I'm getting a slight exhaust leak where those two meet and I don't think I can use the stock donut gasket because its meant for a 2.5" stock exhaust. Has anyone had leaks in that area?...if so what type of gasket would you recommend? A guy from Brakes Plus said he recommended a thick 2.5 flange gasket (5-8mm)....does this sound reasonable? Any tips would help, thanks guys!

10-31-2019, 07:03 PM	#2
86MLR Senior Member Join Date: Aug 2018 Drives: 2002 VX Commodore SS LS1 Auto Location: Sydney Posts: 2,203 Thanks: 500 Thanked 2,185 Times in 1,111 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Maybe this, maybe? https://www.mishimoto.com.au/subaru-...caAjNwEALw_wcB I'm sure you could find one cheaper if you googled for more than 3 seconds. __________________ Disclaimer: This post represents the official views of the voices in my head at the time of posting. http://www.ft86club.com/forums/showthread.php?t=133311 I'm only here for the biscuits

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10-31-2019, 09:16 PM	#4
Joveen Senior Member Join Date: Mar 2018 Drives: Bone stock Location: Windsor, CT Posts: 767 Thanks: 535 Thanked 232 Times in 162 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	GrimmSpeed makes a cheaper one I think. I haven't bought mine yet tho lol. Sent from my SM-N960U using Tapatalk

01-06-2020, 11:41 PM	#7
Try Again Member Join Date: Nov 2019 Drives: 13' Brz Location: Houston, TX Posts: 11 Thanks: 0 Thanked 6 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Use permatex copper gasket maker. Works like a charm

01-07-2020, 10:40 AM	#9
Ignore Your Doctor Senior Member Join Date: Oct 2015 Drives: 2015 BRZ WRB Location: Atlanta, GA Posts: 171 Thanks: 7 Thanked 25 Times in 19 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I bought the grimmspeed 2.5" to 3" adapter and it fixed this issue on mine perfectly. Im actually switching to a full 3" header back so I would give you mine cheap if youre interested.

05-22-2020, 03:20 PM	#11
Ignore Your Doctor Senior Member Join Date: Oct 2015 Drives: 2015 BRZ WRB Location: Atlanta, GA Posts: 171 Thanks: 7 Thanked 25 Times in 19 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	sorry I just got rid of it last week

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