Piggyback ecu. You will need a Type A. Ring Tim Slakko at West Racing and talk to him about it and YOUR car. Best to talk to the main guys workin on em everyday than forums mate. Sounds like your car has a real problem to be doin that so my suggestion is get it checked out either by subaru or a reputable mechanic before it pops. To own a high performance car comes lots of trouble shooting and it will cost you money.