What is the best upgrade for the money, for a 850 Turbo? RIP, CAIT, ECU? I have had 240's for the past 4 year and have had my 850 Turbo SW for a little over a year. I have been beating people in small V6's(Grand Prix, Monte's, Malibu's etc) GTI's, Honda's. I want to know what I need to beat a WRX or a SRT 4? I like the DIY thing so I will save money doing that, but where do I start, and what is the best thing to buy first so I can slowly build?