--Exterior--
I haven't done that much to the exterior either, but here are some pics as to what i have done:
For an intake, all i have is a cone filter attached to the factory intake tubing...only for sound tho...haha. I then have a Warpspeed Y-pipe (2" downpipes to a 2.5" Y->flex section->outlet), CarSound Hi-Flo Cat (2.5" inlet->outlet), then 2" piping back to a 3A Racing DTM-style exhaust (2.5" inlet->dual 3" outlet)

Some newer pics:


And here are a couple draw-backs to the car...

Page One: Introduction
Page Two: Interior/Audio
Page Three: Exterior (you are here)
Page Four: XMODS Skyline