Im moved your thread to the Bolt-On Power Mods section of the forum. We were unable to reply to your thread because you posted it in an Article section. No worries though.
For an exhaust, you want to find something with the least amount of bends in it. 3in diameter from front to back. Pretty simple at that.
For a blow off valve, just get an Evo IX BOV, its metal and doesnt leak like the Evo VIII valve that is plastic. The metal BOV can handle up to 25psi, maybe a little more. And thats all you need for bolt on mods.
Hallman makes some pretty cheap and reliable manual boost controllers. Or you can get an electric boost controller. Ask your tuner if they know how to do ECU controlled boost, I believe that is by far the most reliable and effective way of controlling your boost without it tapering down much towards redline.
Check ETS for intercooler and piping, you should find what you need on their site and they have some pretty decent priced packages. You can even get your air intake on there as well.
The fuel pump youre going to want is the Walbro 255.
And finally, for cams, you really dont want to go with more than 272/272. Id do some research on those to see what brand you want to go with. But my suggestion would be Kelford, or even Comp. Im a big fan of Kelford though.
Where do you live? Its hard to tell you where to get a tune though. I honestly would stay away from the mail in tunes. Especially if you dont have a laptop, tactrix cable and all of the software needed to put the tune on your car.
06 GG Evo SE
I WANNA GO FAST