The variable vane turbochargers used in diesels today to reduce turbo lag, emissions and increase power can also be used to slow you down. BD utilizes this technology by electronically closing off the turbine vanes which can create up to 130 retarding horsepower. This braking force will help to maintain your speeds on descents and curves, giving you better control of your truck and load. Works with your cruise control to automatically accelerate and decelerate to maintain vehicle speed. Easily and simply installs by plugging into existing factory connectors and by mounting the switch on your dash. FEATURES Delivers up to 30-40psi exhaust backpressure Electronically closes off turbocharger vanes to provide engine braking Helps maintain speeds on descents and curves Better control of your truck and load. Different modes including automatic downshifting keeping engine rpm and engine retarding force high Integrated with the cruise control to automatically accelerate and decelerate to maintain vehicle speed Engine warm up feature Easily installs by plugging into existing factory ports Switch mounted on dash INSTALL TIME 1 Hour 30 Minutes WARRANTY Parts 12-Months 24,000 Miles NOTE We cannot guarantee compatibility with all aftermarket products that have a permanent connection to the OBDII plug inside of the cab. Older Edge Attitude displays have a known compatibility issue & the newer Edge CTS and CS are not compatible at this time. H&S Mini Max and Bully Dog 40428 are not compatible at this time.