2004 Hummer H2 Performance Tuners & Programmers

Universal Tuner Switch by HP Tuners®. Diesel Switch by HP Tuners lets you power up from a stock calibration to one of five custom maps with the turn of a switch. Pair with HP Tuners Switch on the Fly OS for complete control and...

2 to 1 OBDII Cable by Rough Country®. Rough Country’s 2 to 1 OBDII Connector gives you the freedom to use multiple accessories without having to access door panels to locate factory wires.