Start off with your basic bolt ons, I/H/E. With that combination you should see gains between 10whp to 15whp. I'm not sure about the ms3 turbo fitting the regular 3.
a mazdaspeed turbo will fit, aswell as the manifold, downpipe ect. but for the cost of it you can make your own hybrid set up that will be more efficient and cost less. that is if you are buying new.
