Introduction TunerCat OBD2 Tuner is a software package that allows tuning of 96-current GM vehicles.  For some early 96-97 vehicles, it is often the only solution. TunerCat OBD2 Tuner must be purchased with our RoadRunner hardware (either with a complete RoadRunner ECM or just a RoadRunner Guts kit)  due to licensing restrictions.  TunerCat OBD2 Tuner […]