i hear the WRX has some special sensor that will adjust its ecu to altitude changes so no matter where you go, it will continuously change the settings to get optimum performance.
does your G feel stronger than when you first arrived denver? if so, then they might've changed something in the car to make it perform better... from my honda buddies, I hear that the ecu on my honda cars will adjust to the new environment after about a week of driving around in the same atmosphere. could be only on my lude and not the civic. dont know.
i think its time you get a nos kit. hehehe. 
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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.
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