I bought a DiabloSport Predator thinking it would do the tire size change but it only does that on the 06 and up. Mileage is also a factor. The truck had been getting about 17 to 17.5 mpg with the Diablo Predator my mileage is now 21.5 to 22.3 I have changed from stock tires to 325/70/17 (about 33.5in tall) speedometer off by about 8 mph. I have to have a programmer that will let me correct my speedometer. I love the power & mpg gains from the predator. Would like some input on what my options are.

 

The SMARTY can do it. Or you can take it to the dealer and have them recalibrate for the tire change.

MikeyB

 

Smarty, Smarty, Smarty, it can do it for you and give you one heck of a ride too!

 

Your mileage might drop some when you correct the tire size, at least mine did, but definitly Smarty!!!