Sounds real nice, that's alot of work done for an 07.
I know. There's not that many worked 06+ Si's around the area. There's your common Intake/Header/Exhaust combo and some wheels and dropped, but as far as turbo, there's only 2-3 cars.
I'm pretty much done with the power mods. I wanna go 3" all the way, but I'll wait till Skunk2 comes up with one for the Si.
Now on the list is get the Skunk2 Pro-C Coils, upgrade the brakes (stainless steel lines/pads/rotors), and probably a rear sway bar and a H-brace.
Once that is done, I don't know. Maybe add a rear lip and side skirts, work on the audio system some more?