I recently bought my 03 wrx. The old owner had to put on the stock exhaust, headers etc. to pass smog and sell me the car. now that I have the stock headers, exhaust put on the car things are starting to break. Im wondering where I would go to tune my car back to stock. Im pretty sure my car is tuned to have all these aftermarket parts, I just want to know how i would go about getting it tuned back to handle the stock headers, exhaust.
The car is running poorly right now. I have an engine light on and scanned a p 1088 which is some sensor. the car is idling poorly and just not getting full potential out of it. a few months ago I got a check engine light for a bad purge valve which I had fixed. I keep getting problems with the cars exhaust which is why i think it needs to be tuned back for the stock exhaust. I am the 3rd owner and i guess the 1st owner did all the work. The guy i bought the car from doesnt know much on the matter. He isnt sure if the car was ever tuned. I am assuming it is tuned for these aftermarket parts I have sitting in my living room, based on the way i keep getting check engine lights and faulty parts/sensors. So the dealership would be able to get me back to my stock settings? and what needs to be reset? the cars main computer?