17-21 GM Duramax L5P HP Tuners Modified Unlocked ECM Service:No Exchange (2) Turbo Coolant Return Plug

(2) Turbo Coolant Return Plug w ClampCore

Improves fuel mileage

(20) Cylinder Head Studs (Shorter)

Chevrolet/GMC 2006-2007 6

Rudy's new up pipe is your solution

17-21 GM Duramax L5P HP Tuners Modified Unlocked ECM Service:No Exchange (2) Turbo Coolant Return PlugHP Tuners exclusively presents our L5P Modified ECM Purchase & ECM Exchange Service, giving you the power to tune your 2017+ Chevrolet Silverado GMC Sierra 2500 3500 6. 6L Duramax. You now also have the option to either purchase an HP Tuners Modified ECM or send us your original ECM and we will exchange it for a HP Tuners modified one. Both options give you full access to calibrate, log and scan via the OBD2 port with your MPVI2 and VCM Suite 4. 3+!