lol nice man, its hard to find 3g. eclipse that look good. Well as far as the engine goes and if you want upgrade parts your pretty screwed. This is the second engine this car has had and i had to get custom pistons, then crank, fuel lines, injectors,throttle... lol list goes on but in short i built the engine for the stress of the track. But if want to upgrade its not cheap at all but when i first got my cat i just did headers and then cut off the muffler and did dual pipes with 4.5" tips. Its not to much louder but sounds soo good!! Better than any muffler you can buy. Sounds like a loud 350Z or vr-4 3000gt. But no joke i know a lot of little tips and tricks to these cars, so if you need any help just let me know.
Thanks, Ryan

Hey i have a 2004 3g GTS and the color scheme is almost just like yours, i like it, and i wsa wondering what you have done to the engine so far,. mine is stock as of now, except a k&n cai!