STI is awesome...300hp, all wheel drive, how much better does it get?!! My hubby drives the Subie, the X is mine! We threw some winter tires on the STI but no major mods (yet). We were thinkin bout chipping it...we'll see. I chuckle at those who complain about gas mileage on the Xterras. The STI is WAAAAYYYYYY worse! The neighbours look in our driveway and call em the "tank and jetfighter". X is knight armor and STI is a gunmetal grey color. We've even been stopped in coffee drive-thru's and asked what type of vehicles we're driving. (It's ford, chev, dodge country here) Love it!!!!