Well I've done a few to my 03 GT over the years, CAI, cat back exhaust, short shifter, upper & mid gate spoilersOthers have done various suspension mods from lowering to anti sway barsYou can check out my garage page as I can't remember everything I've done off the top of my head:http://forums.genvibe.com/zerothread?id=35921
Would you agree to debris acceptance? 2003 Vibe GTMods installed GM Top and Mid-Gate Spoilers, Cosmo CAI, TWM Short Shifter with Desert Eagle weighted shift knob, TWM Bronzoil Shifter Cable Bushings, Magnaflow Cat Back Exhaust, Unichip, Injen Billet Aluminum Engine/Sparkplug covers and oil cap, Optima RedTop Battery, Lineage Ground Wire KitAwaiting install: Energy Suspension Motor Mounts, DC Sports Header
the gt is kinda maxed out for power from factory without going crazy on modding it out. depending on what you want you could put an exhaust system on it but really the only gain you get is better exhaust tone, not sure i really noticed any power gain when i put mine on but it sounded better.seen people put the pully kits on and blow their motors, so i wouldn't go that route either.good luck with your search
2003 VIBE GT, CONVERTING TO RALLY CAR. http://forums.genvibe.com/zerothread?id=463112004 vibe gt magnaflow catback exhaust (bought totaled 9/06 with 1600 miles, fixed it and in love ever since2004 HONDA CBR1000RRASE Master certified mechanic