[XMASTERX87]

I have a 1998 mitsubishi eclipse 2.0L GS
(im sure its a GS, but how can you definately make sure if its a GS or an RS??)

i want to put some money onto performance parts... where should i start, and what would be really worth buying??
i already have a short ram CAI and DENSO Iridium plugs... and bosch wires, which im gonna change for NGK soon...

WHAT SHOULD I INVEST!!! SUGGESTIONS PLEASE!!!