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Old 05-22-2022, 07:05 PM   #1
Scooby Newbie
Member#: 523586
Join Date: Apr 2021
Location: PNW
2008 WRX

Default 2008 WRX TMIC Coupler Install Q

Hey all, correct me if I have posted this in the wrong section as I am new.

I bought a "Perrin TMIC Coupler Kit Red" to replace my OEM one shown below in black. I wanted to replace the OEM one because it was not seated on the TMIC neatly. It functioned as it should, but it bothered me and thought it would be an easy replacement.

Upon taking OEM piece off and putting the Perrin on I realized it was not working out how I had hoped. Struggling with it for about an hour I was able to at least get the TMIC and toppings reattached.

The unwelcome news and my worries: The Perrin tubbing is significantly indented The OEM appears that it too had an awkward bend to it in the same spot. I started to think my turbo, or something was out of position. So, do I need to try and find the sweet spot to make the Perrin piece not be indented or should I just stick with the OEM?

https://ibb.co/3fPTDT1 OEM
https://ibb.co/2qNxF1R OEM
https://ibb.co/wWGtrJq OEM
https://ibb.co/Jdtpmtv Perrin in place
https://ibb.co/f2VZJCK Perrin in place
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Last edited by BonesisWRX; 05-22-2022 at 07:10 PM.
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Old 05-23-2022, 12:57 PM   #2
Scooby Specialist
Member#: 491095
Join Date: Sep 2018
Chapter/Region: SWIC
Location: New Mexico
2009 STi Blue


alot of the aftermarket ones need to be trimmed to fit
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Old 05-23-2022, 03:17 PM   #3
Scooby Specialist
Member#: 519868
Join Date: Nov 2020
Location: Chicago
2010 Impreza WRX
Satin White Pearl


Mine didn't require trimming. That's usually the turbo inlets.

I'm using the same hose. It just needs to be clocked properly. Maybe it's wrong length wise, so flip it. Once it's orientated correctly it goes on without a hitch. No kinks or anything.
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Old 05-25-2022, 02:17 AM   #4
Scooby Newbie
Member#: 528070
Join Date: Dec 2021
2005 WRX STi


I just installed a Grimmspeed turbo/throttle body coupler for my Sti and had to trim the turbo coupler significantly in order to get the TMIC to fit properly. Without trimming the couplers would not seat properly. Compare the stock couplers to the perrin ones and see the differences and trim accordingly.
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