So far, i havent really done all that much to it! just a K&N air filter, cat-back flowmaster (i got ripped, im getting a new Cherry Bomb put in cause they sound GREAT on 4 banger frontiers and theyre MUCH cheaper, too!) but the engine is a KA24DE, with some enhancements that make it incompatible with all bolt ons from an S14 basically, because the throttle body points upwards and apparently theres another catalyst (which i cant actually find...) and i'm almost done with the audio. nothing special, but i need an amp for my front speakers (Polk Audio DB6500 components, they dont even have the x-overs yet) and some POS sub from a friend of mine, with an amp i got for a slight deal at this audio convention with my deck. oh and i plan to do a lift and throw on a set of GMC Sierra Z71 wheels and tires (stock) over winter break. should be fun.