So is the sct6600 new and how does it compare to 1715, 9300, etc? I have a very stock 02 f150 4.6l (with hopes of future mods) how can this chip help me out? By the way I have 285/75 tires on the truck and the speedo is way off, can the chip help me out with this?

 

This is what Mike T. told me.

The 6600 gives you the same tuning as the 9100 and Excalibrator because it is the full on custom tune. You dont get the code scanner and some of the other thinks, but you do get the 4 different tunes that you can change on the fly suposedly.

And yes, he can calibrate it for the larger tires and get your speedo right.