2018 - 2021 WRX FA20 Air/Oil Separator (AOS) Install Instructions | IAG Performance

[@Head_Case]

I know that this video was made a year ago, but I just want to say that this was the absolute perfect instructional video I’ve ever seen! Concise, clearly explained and the video was perfectly shot. I was going to go with Perrin for my AOS, but I plan on getting it from you guess solely based off this video. You even remembered to tell people to cut off the tail of the zip ties! Great job. (And I never comment on KZbin videos either. lol) LUUUUUBE!

[@jamesmendoza2405]

Sweet I will finally be able to install my AOS now confidently. Thanks IAG

[@robvanhalen9696]

Thanks, IAG for this detailed video. Just did the install on my 2020 WRX and was able to do it (mostly) stress-free, with the exception of the re-install of the charge pipe, which is a pita. I was a little surprised to find an extra hose in the box after the install, but some research revealed it was not needed for my year of WRX. Thanks for including plenty of hose clamps in the box since one of them was damaged. The hose clamp pliers are highly recommended, they really make the job much easier! Mounting the can was a little challenging since it gets really tight in that passenger side corner with all the cables, but I was able to make it fit.

[@parkershelp6428]

How long did it take you with no experience?

[@robvanhalen9696]

@@parkershelp6428 Probably 2-3 hours and I really took my time to do it right and neatly and checked every step multiple times. Like so many other people I wish I had done this earlier.

[@trombonesrock1231]

Installed my AOS last night on my 21 wrx. I was surprised as someone else was with the leftover hose at the end. The only tip i would recommend is that removing the EGR tube is a MUST!! Its damn near impossible to get access back there for the pcv valve. I ended up having to remove the tube a second time to regain access to seat the 90° hose and clamp onto the pcv valve. Bleeding the coolant was a bit of a pain, very hard to see with the wiring harness there to see if the coolant is coming out or not

[@andrewknutson91]

Dear God, this looks SO MUCH EASIER to do than the EJ on the '21 STi. That thing was a nightmare. I just traded my '21 STi in for a '21 WRX Premium. This will be the first mod I buy and install.

[@LSTeg1994]

That's different! First time I've heard someone traded an STI for WRX. What motivated your decision to do that?

[@SaltwaterItch]

@@LSTeg1994for real I’m interested too lol

[@andrewknutson91]

@@LSTeg1994 Financial. I took a previous job back that paid $20k less. I couldn't handle the new job mentally because my org just threw me to the wolves with no training.

[@daviddin8863]

Great install video, I wish some of my parts from other companies had this comprehensive of installation instructions. Maxton design had literally 2 sentences for their products.

[@theiagchannel]

Thanks for watching!

[@milessamb]

OMG the lube joke at 15:25 caught me so off guard🤣.

[@hortonhearsawho9889]

i haven’t bought this kit yet but it makes me want to because of this video. very great install vid 🙌

[@troymccarty9446]

This video would have made my life so much easier two years ago, noice though!

[@ashketchem9397]

Just picked on up for my 2019 WRX. So excited for it!!

[@Jacob_Does_Stuff]

Just wanted to 1. Shout out to IAG for the awesome video. 2. If any of you have a charge pipe I recommend using the other hose that came with a kit to replace the coolant hose from the top connector so it has enough room and doesn’t kink next to the charge pipe.

[@apr7853]

which line in he kit is that?

[@santoscarrillo2996]

I'm doing this on Saturday glad you showd me how

[@SGQ12]

Yeah! This is it! Thank you for this.. more video to come for FA20DIT..

[@theiagchannel]

More to come!

[@maishshoespalace4147]

How much is the block 😊

[@lonelyglizzy2029]

Is this my sign to get one? I was watching unrelated videos then this vid popped up. Yeah it’s time to get one lol

[@theiagchannel]

Let gooo!

[@omarvazquez7178]

The best video to install “iag”👍🏾

[@BoodymeatJr]

Really informative and dummy proof. I want to get one of these for engine health but by golly that is a ton of work and parts coming off. I had a night mare installing the Cobb shifter plate and intake so this gives me anxiety that I’d break something or not torque it down all the way. I will say that if/when I pull the trigger on a downpipe and upgraded charge pipe and intercooler, I’ll likely do this since I’m down there anyway.

[@gwynbleidd7177]

I'm about to do my install this weekend. I have the printed guide all ready to go and I'll have this video up lmao.

[@TheeJayRed]

@@gwynbleidd7177 Same here!

[@nickymabalay5423]

​@Gwynbleidd any link on the printed instructions

[@justinshute5726]

Good install video, my only question is did this guy just ride 100 miles on horseback? Not sure the stiff legged wide stance???? Luckily he stayed off camera for most of the time

[@koltonokeefe3035]

Finally a clean direct install video

[@mckaywinn8759]

Hey IAG! I’m just curious on the crankbreather hose Cobb says to plug it in the top, and plug off the bottom, I was curious if you knew which one is right?

[@AoiKaze2000]

Just do us all a favor and release an install video for all the kits.

[@Vette1320]

A lot of key info left out that would be helpful. Their recommended bracket position to the can for VA's caused mine to ride. Good thing they are a lot of different positions to use. Would have been really helpful to note that eyeing up the coolant hose to the turbo to keep in mind how it routes once the charge pipe gets re-installed.

[@backINblack626]

If you have a Perrin strut bar you need to move the bracket up one hole or it will hit the bottom of the bar! Heads up!

[@WedgewoodGarage]

Do I need to purge/burp the coolant system after? Besides on the AOS itself Thanks

[@lagaliparacing5347]

Thank you 🙏🏽 so much for this video!!!

[@theiagchannel]

Glad it was helpful!

[@jesslloydjansen]

I live in a cold climate, in Wisconsin. Will this AOS have any issues with condensation freezing in the winter?

[@Mufflee]

THE LOOOB!

[@mathewmontez3666]

Great video used it yesterday

[@_AlcyoneSVX_]

So what happens if you get coolant into the turbo inlets? 😂 I forgot to cover those and it may have gotten in there

[@NIGHTFOX216]

💣💥😂

[@mikekillion4731]

These instructions apply to the 14-18 FXT, right? What does everyone recommend doing at the same time of this installation? Bypass valve, charge pipe, intercooler, heat wrap for the latter two, radiator fan, anything else?

[@GeorgeWBushDid911]

Man this isn’t nearly as bad as I thought

[@LL8705]

Great Video just concerned about the ecu wires right up against the hot can

[@XboXJoe1980]

Might be able to put some sort of shield if it concerns you.

[@jesslloydjansen]

I cant figure out why you have to remove the charge pipe. Seems like it can be done without pulling the charge pipe off. Thoughts?

[@LapisBlueWRX]

Ok real question. The kit I got is the newer quick connection. Can I follow this step by step? It’s essentially the same minus the need for all the hose clamps right? Gonna tackle it this weekend

[@theiagchannel]

Use this updated video: kzbin.info/www/bejne/jmrdpWCuf8h_pbc

[@spoopdiewoopdie8092]

What’s the difference between 16 wrx and 18 wrx. I’m gonna install this over the weekend in my car and I have a 16. And the best install video I’ve seen is from you guys

[@theiagchannel]

The main difference is just the relocation of the ECU in the engine compartment. If you follow the pdf instructions on our site along with this video you shouldn't have any problems.

[@spoopdiewoopdie8092]

@@theiagchannel I did. Instructions are spot on.

[@jeremy5421]

Great video

[@theiagchannel]

Thanks!

[@shawng7902]

Shaking my head. I litterally did every bit of this fixing a bunch of vacuum leaks this week. Put all perrin from cold air to charge pipe. Monster mishimoto top mount. Pcv valve will still have my blood around it that I missed when the vehicle comes back. 1st wrx Ive worked on. Pcv valve is the only hard thing to get to I found.

[@davidawaters]

How many hours does this usually take for an average guy doing it the first time?

[@redrexx12]

Great video. Can you explain why you need to disconnect the battery? Did you perform the battery reconnect procedure?

[@theiagchannel]

It's always a good idea to disconnect the battery when working on any engine components.

[@subiekeo]

Need one for 08-14 sti !! Since it’s the v3 aos !

[@theiagchannel]

Coming soon!

[@mikobautista5212]

Hey I followed everything here but just wondering why do I have extra hose with a 90 degree fitting In it that I didn’t see from here? Any idea about that?

[@theiagchannel]

The extra hose is for a different model year. You won't use it for these model years.

[@WillT999]

as someone whos never built a car but wants to build my subi should i hire a mechanic or do it myself so i can learn

[@theiagchannel]

You can start with some simple bolt-ons and learn to do those yourself, but if you plan to get into the engine we recommend using a professional mechanic.

[@bmoore7167]

Question Installed one of these in my 18wrx and still getting oil through the breather. What could be wrong?

[@SGQ12]

@Jim Matusky turbo seal where about that? Would you please send a picture here or any diagrams that turbo seal always prone on leak? Pls pls and thank you

[@peezy304]

when you take the bracket for the wring harness off , do you just leave the wiring harness in the same place or tuck it down ?

[@theiagchannel]

You can leave wiring harness in the same place since it is basically supported by the AOS mounting bracket. Or you can tuck and ziptie the harnesses behind the AOS can if you want a little bit of a cleaner look.

[@peezy304]

@@theiagchannel ok thank you for the quick response

[@LL8705]

Will the wires be ok up against the AOS as it gets hot?

[@eliegom101197]

I have been looking for days for a good torque wrench, can someone recommend an inexpensive one? one that can do small jobs like this one and some other bigger ones.

[@diapermaverick6287]

LUUUUUBE

[@cfletch3173]

Does this guide work for a 2017 wrx?

[@redone8341]

How long does it take for coolant to come out? The Can is getting warm but no coolant coming out when I opened the bleeder.

[@theiagchannel]

Coolant should come out by the time the vehicle has reached operating temperature. If it doesn't you may need to check your coolant level and add some.

[@redone8341]

@@theiagchannel thanks for the quick reply! I just found that I have an obsolete model. ENG-7151. Apparently, it has no bleed screw. The screw I released was just a part of the frame lol.

[@andrewknutson91]

@@redone8341 Hahaha that's funny!

[@redone8341]

@@andrewknutson91 I feel so dumb hahahaha

[@randomviewer2730]

So only the 15-16 WRX have to relocate the ecm and bend brake lines? I was watching a different video and that kinda turned me off, but i have an 18, so mine should be closer to this install? This one looks tedious, but easy

[@apr7853]

I did this myself watching 2 videos on KZbin took 10 hrs and a lot of bitching but was simple enough. 3 months later still no leaks or anything just take your time and dont rush

[@llryuujinll]

@Jim Matusky Lots of updates, all these new hose clamps instead of zipties. they must saved a ton from that cast can, to give you all the clamps.

[@SGQ12]

When you installed this V3 version the car must go to tuned (Cobb ap) I mean retuned because of AOS. Would you please educated me on this concern of mind. OR no need to tuned via Cobb ap. Thank you in advance to anyone can educate me on this..

[@theiagchannel]

The street series AOS does not require retuning.

[@SGQ12]

@@theiagchannel thank you admin. Keep safe and warm.

[@SGQ12]

@@theiagchannelits me again after 2 years. Now I found out that most of the time there is oil in my intercooler pipe's upper part near the intercooler. Now this oil was normal? Or some other says oil vapour. Is there something wrong? Do I need to know installed back the pcv valve like a newer video? This makes me bother a lot.

[@theiagchannel]

@@SGQ12 The AOS is designed to allow oil suspended in the PCV system to drop out of the system under normal operation. With that being said, if you engine is exhibiting a large amount of oil in the PCV system you may have other issues. Depending on mileage, driving style, power output, etc, your engine may have more oil being put into the PCV system. It's also possible you are having an issue with your turbo that's allowing oil to get into your intake. We would recommend having your vehicle evaluated by your mechanic to ensure that your engine is healthy. The AOS does a great job of separating the oil from a properly functioning system.

[@sebastianbarnhill9990]

Will this instal video work the same with the Cobb aos??

[@theiagchannel]

Yes!

[@redskoob]

Stupid question... Is it bad to install this without a tune? I heard that Subi's get wigged out when you do ANYthing to them without a tune. Not sure how true that is. Thanks in advance!

[@LunasLostLove]

this is from phatbottituning "IAG states that the Street AOS does NOT need a tune and the Comp AOS does need a tune. I have tested 5 cars before/after Street installs and 5 cars before/after Comp installs and I saw no significant change in fueling or boost. The AOS' were the only mod changed in each test. Having said that, I NEVER recommend installing mods outside of a tune. Especially ones that require removing and reinstalling the intercooler, charge pipe, breaking into the coolant system, relocating the ECU, etc. There are a lot of things that can be messed up during large complicated installs like this and it's simply not worth the potential time or money to risk it. Simply take your time and gather all your mods, then install everything at once and get tuned once. " TLDR: no tune required but recommended. from my experience the only thing i did to my car without a tune is a drop in filter and muffler delete with no issues.

[@redskoob]

@@LunasLostLove THANK YOU! Huge help!

[@wrx8132]

I have a question where the first port goes

[@bennguyen8713]

Would this work on my 2020 wrx limited?

[@theiagchannel]

Yes!

[@cheezy1620]

Is this the same install for the 2017 wrx?

[@theiagchannel]

It should be pretty close.

[@charliemagnegutierrez9979]

Is this how you install aos to 16 wrx too? Because it’s says 2018-2021

[@theiagchannel]

The 15-17 model year WRX requires you to relocate the electronic power steering control module in order to properly mount the can.

[@phdavid4]

So no video to explain?

[@street_bull03]

What is the top most side port that was blocked off go to?

[@peoriavideosltd6822]

That port is only used on the EJ engines which have seperate breathers for each cylinder head.... IE, one more than the FA engine has.

[@inno2512]

This video would of saved a huge headache 3 years ago... oh man...

[@theiagchannel]

🙈

[@ireneestrada9996]

What year is this Subaru

[@dougl4253]

Can you guys do the v3 on a 15+sti

[@theiagchannel]

kzbin.info/www/bejne/jprOYaqKmcydl80

[@69wdforty]

Will it fit on the new 2022 WRX ?

[@theiagchannel]

We are working on a new fitment for the 22s!

[@69wdforty]

@@theiagchannel Awesome I will be putting one on mine as soon as possible.

[@BellAmanda-u1i]

Champlin Hill

[@MacDrumheller-x3x]

Auer Spur

[@EvelinaIna-t5w]

Hyatt Dam

[@J_Pisciotta]

Anyone else annoyed by this guy saying "blow off valve" instead of "bypass valve" lol

[@kawiflow6020]

What is the torque spec for the banjo bolts. Mine is leaking coolent