Think all cars built in last 10 years have ECU that will automaticly adjust for CAI, Cat Back, and bigger throttle body mods. Harley Davidson MC's are only ones that still need ECU programing for those mods that I know of Today.
To tweek your ECU for highter MPG (less HP)or greater HP & Torque (lower MPG)you will need to program your ECU. ECU does not adjust for different sized tires or gearing.
Purchased July 15, 2011
4 x 4 with 5 Speed Auto
With Roof Rack, Comfort, Convenience, & Upgrade Pak
Added: Bumper lights with low beam hack, In bumper Fog lights (Swiss Army's) TRD Oil cap, factory trailer hitch with 4 flat plug. Thule rack adapter for skis, boats, & bikes. DeMello Hibrid bump out Sliders with mesh, axe, shovel, high lift jack. Gobbi Lader so 9yr. old can get to ski box. Cooper snows on 16's for winter.