I am currently running stage 1 on my FiST. I have an access port, the motor mount, and a full intake all from COBB. I want to run the stage 3 tune, but I know some hardware changes are necessary first. I don't just want to go straight to COBB, and spend 2 grand on their parts, when I might be able to achieve the same results with different parts from different companies. In theory, I think I could just get away with doing a Mishimoto FMIC and a high flow (or catless) down pipe. Would I run the risk of damaging my car if I ran stage 3 on just those parts, without charge piping and a full catback exhaust? If so, what should I do to reach stage 3 cheaply?