Picked up a Grimmspeed AOS to fit to my V6 STI engine and struggled to find any concrete info on how to install it, can anyone chime in on whether this is the way it should be?



Head breathers T-pieced into a single line to the AOS, crankcase vent hose re-routed to AOS, and the rubber hose off the intake behind the alternator pulled from the hardlines and rerouted to the top port of the AOS.

I capped the male end here (pre install pic) when I pulled the crankcase hose to go to the AOS as per the Grimmspeed instructions.



Most of the instructions out there are for GD's with TMIC's, not much good when the GC8 head breather hardlines aren't the same!

Looks right from here, rocker covers and block breather into the bottom and back into the intake from the top one, basically the mesh inside is supposed to stop oil and drip back into the filler, helps but not as good as a good catchcan

Thanks for that, I know a catch can would be more effective but its probably overkill in my case, car is only driven on the street & it's not pouring buckets of oil into the intake. If it doesn't do the trick I'll upgrade.

Doesn't matter which way you do it. Still wont work.

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Maybe its model difference or oil quality, but before having aos, my sti used 1.5l of mobil one 5w30 per 5k. Now use less than 100ml redline 10w40. It works for me.


using the Perth-WRX mobile app

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MY08 STI 422whp at 1.5bar on E85, built by Diversion Garage, assembled and tuned by EvoR

Update from new owner: 375whp at 1.4bar on 98, at Tokyo Motorsport