humm....if the o2 sensor isnt functioning correctly ie: not reaching max voltage then the service engine light should go on. the fuel/air mixture is incorrect. but if it doesnt come on on your car, then its probably okay. the difference on my car was night and day.
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1998 Prelude SS - TEIN HA with upper pillows, SSR Integrals 17x7 with SP8000 (215/45), GReddy Evo catback, Iceman Comp Intake, DC Sports header, Apexi VAFC, ZEX 55 shot with bottle heater, NOS blanket, Factory Body Kit, Spoon F/R tower bars, JDM Foglamps, Carbon Fiber trim, Razo pedals &knobs, Fiamm Dual air horn
Future Mods: Lighten car, 2nd 10lbs nitrous bottle would be nice too.
2001 G20 P11 AT- TEIN NA, TRM Snipers 17x7 with Potenza RE910 (215/45), Arospeed Dual-outlet Muffler, K&N Drop-in Airfilter, WW Front Lip, Nakamichi MB75 1DIN 6CD Changer/Receiver, FIAMM Dual Air horns, Levoc Pedals, PIAA (H4 Superwhite H3 Ion Crystal, 168 SuperWhite)
2002 WRX MT- TEIN HA's with upper pillow mounts, 1000Miglia HT3 17x7 with sumitomo HTR+ 225/45/17, painted side skirts, Cusco front & rear strut bar, Whiteline rear swaybar, aluminum endlinks, Blitz NUR Catback, HKS seq. BOV, factory front lip, rear valance, Kartboy short shifter and bushings.
Future mods: dressup wheels with Potenza S03 225/45/17 tires, TurboXS UTec, maybe an uppipe.
by then, it'll be fast enough.
fiamm dual air horns.