Hey everyone, I am fairly nerw to the Subie wrx/sti scene. I have an 03 wrx that has an invidia cat back, a catless downpipe, a turboxs catless uppipe, and I have to replace my turbo cause it's burning oil. I bought an AEM Truboost controller, and a 16g turbo to install. I was just wondering if these mods require an ecu tune for proper functioning and if so, do I need the COBB Accessport or can the ECU be tuned at all without one. Thanks everyone.