Ok. I have an 03 WRX and I am about to put on a VF30 Turbo, ID1000 injectors, STI uppipe, AEM Truboost, Cobb air intake, silicone turbo inlet, and I have aftermarket tubo back exhaust... I am wanting to put a bigger TMIC on while I am doing this. I am looking online and seeing some for $900+ and some for $130. So what is the difference here? What do I want to look for? What makes the biggest difference? I would really like to find an STI one and be done with it. Any help our there?