Finally I can have piece of mind!
Purchased the V3 after a bit of research and after a pretty involved install it is finally on. This wasn't a super hard install for me because my 19 WRX doesn't have much by way of rust or build up around the existing bolts and hoses. Also I am not to shabby with a wrench. I chose the Crawford v3 AOS because it uses the ambient temperature in the engine bay to heat the AOS so there isn't a need for coolant lines. After running the car for just a few days I can already feel a difference in performance. The engine seems to run smoother and its like it woke it up just a bit more. If you're looking for an AOS for your DIT FA20 then you already know that you should have one. So do your car a favor and get it done. If you're not mechanically proficient, than do not attempt this install by yourself. Import image racing, you guys are the best and thanks for always shipping me great mods in a timely fashion! You have a loyal supporter for life. (Don't mind how dirty my engine bay is in the photos, it needs a good cleaning)