I got my car from CBRD in York...they know turbo cars well, and specifically STis and EVOs. They use a Mustang Dyno, so your car will be properly tested under load. This region actually had a dyno day there a month or so before I got my car there, which is how I found out about the site.
CBRD has only been around for 9 months or so at this point, but it isn't Chad's first time running a performance shop. Also, the head mechanic drives an 06 STi. And I have seen people bring ProRally Subarus in there for tuning...definitely well-respected in the racing community.
I know there are a couple places in NJ, too, but I have no personal experience to share. I think if you search on this forum and others, you will find a lot of people recommending some of those others.