I'm fairly new here, well new to subaru in general. Picked up my first 07 wrx 2.5 bone stock, and I had a few questions.
First of all I don't assume you have to tune for all mods to the engine, well atleast you wouldn't think so.....so the question is, is my rex gonna thro a code if I put a catback on there, or a turbo back? I learned the hard way with the cold air intake and had to put the stock one back on as well as reset the ecu.....no fun.
Any guided dirrection would be greatly appreciated!