I don't know how good they are with wrx's, but i heard that Sublime is supposed to be a really good shop. A guy i worked with this summer highly recommended them ### thats where he takes his G35 that puts out like 500hp.
Ya sublime is on point for the most part. The only thing is it takes foreeeevvvvveeeerrrr to get parts through them and they also don't have an all wheel drive dyno. But you gotta make due with what ya have.
You could drive up here to Sioux Falls, SD, Excessive Autosports does great work, you can call them at 605 332 0000, they have the Ecutek software if you don't have EM, that's what i'm using right now, it works great, and they're actually really nice dudes. i know the shop in omaha has sent excessive some of their bigger projects, so that tells ya something.