Hypertech 730129 In-Line Speedometer Calibrator Module 20-23 GM 6.6L Duramax L5P MISH-MMRC-11-FRD Without the required vapor space

Without the required vapor space in the tank

Custom molded CRACK RESISTANT lifetime warrantied dash cap

0" mandrel-bent aluminum piping eliminates the restrictive stock resonator and improves flow by up to 55% over stock

Intelligent Shift Tuning - Gear shifts are optimized for each power level to protect the transmission and increase shift speed while protecting against torque converter and clutch slip

Hypertech 730129 In-Line Speedometer Calibrator Module 20-23 GM 6.6L Duramax L5P MISH-MMRC-11-FRD Without the required vapor spaceGet accurate speedometer readouts and proper shifts with the Hypertech Speedometer Calibrator for your L5P Duramax. Hypertech's In Line Speedometer Calibrator Module is a plug and play module that corrects the speedometer and odometer for non stock and or gear ratios. With the included USB cable, connect the Hypertech In Line Speedometer Calibrator to your PC and enter the new tire size and or rear gear ratio. There are no limitations to tire height