I installed one on my Golf-R a while back as well. I love the AP!
I have a stack of 3 right now (16 STI, 19 WRX).
Got a great deal for 500 shipped used for a few months, still looks brand new, can wait to install it just waiting on a battery tender to come in the mail.
Going to do stage 1 91 first and see how it feels, so far I have a afe drop in filter ECS intake pipe and turbo inlet pipe, picking up a Clubsport muffler as well. Should make a nice difference.
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