I have been in business for almost 3 years now and have serviced just over 2000 cars(check my books). I have seen it all and a lot of Subaru's destroyed because of a bad tune. This year we have done 6 engine builds and i have more blown here because of a bad tune.
So, go ahead and have your boy drop a tune in your car and i will be seeing you real soon. BTW I keep engines in stock.
I just recommend pro tune from SS,GAb,Jestr or from any other protuner. A tuner that has some time under there belt and just will not tune around engine issues (like Maf, Vacuum leaks, etc...)