HP Tuners is a go-to platform for older diesel trucks and specific builds that need direct ECM/TCM access outside of EZ Lynk or EFI Live's supported range.
RDP Tuning uses HP Tuners for full calibration work — fueling, timing, boost, and transmission tuning — delivered via bench flash or cable connection depending on what your specific platform requires.
This is the wild-tune-friendly end of the lineup: if you're running a built classic Duramax, an early Cummins, or another supported platform outside EZ Lynk's coverage, this is likely the right tool for the job.