Superchips Flashcal Speedometer Calibrator and Diagnostic Device 01-16 GM 6.6L Duramax YUK-YG C9.25R-411R-14 you'll benefit from added horsepower

you'll benefit from added horsepower

each of which is competitively priced

or changed the rear gear ratio

3L Turbo Thruster for the 1999

Superchips Flashcal Speedometer Calibrator and Diagnostic Device 01-16 GM 6.6L Duramax YUK-YG C9.25R-411R-14 you'll benefit from added horsepowerUpgrading your Chevy or GMC to larger tires is one of the most popular upgrades. That said, recalibrating your speedometer typically would require a trip to the dealer. Especially if you are prone to swapping betwen tire sizes for winter or other purposes, this can be a cumbersome effort running back and forth. Further, when a check engine light pops up, wouldn't it be nice to find and clear the code yourself? The Superchisp Flashcal is a product