The calibrator is like a newer better model of the optimizer with 2 potentiometers, one for low speed and one for high. This will need to remain pluged in at all times.

The tuner works with your laptop and as the description says you can self tune the MAF for injector changes and general tuning at different voltage points.

99 Cougar V6 MTX...Plenty of mods My best mod thus far: Trans: Brand New MTX-75 with B1 gear set, Quaife LSD, 4.5 Final Drive, Spec Stage 1 Clutch, Spec Aluminum Flywheel...