Install was easy with their writeup and YouTube video, both were easy to follow. I have no way of reading temps, but I saw an increase in recorded max boost, although I did install this at the same time as a COBB charge pipe and GrimmSpeed turbo inlet and GrimmSpeed BPV. It all worked really well together (except I wish I got the GrimmSpeed charge pipe because the COBB one did not match up well to where the GrimmSpeed bits located the BPV. If you're going to do the turbo inlet, charge pipe and BPV, get them all from the same company. I highly recommend GrimmSpeed. The WRX has been pro-tuned and they made no mention of it heating up at all, so I assume that is a good sign.
Beauty and the boost
I mostly picked this up because I live in California and since I’m running a beefier stage 1 tune I figured it would help control any potential knocks in the summer. Good god what a beautiful piece! Every weld is professionally done, and the installation was simple even for someone greenish to working on cars like myself. In comparison to the OEM piece you can immediately tell where your money is going: the GS is beefier, heavier, but weirdly enough does not cause as much of a boost pressure loss from increase in core size as I thought it would. If you’re going to trust GS for anything definitely trust their abilities with their intercoolers. I’ll be complementing it soon with their charge pipe to really solidify the whole engine package. A must for tuners looking to get the best from their cars.