Improve functionality of the OBDII port on your 2020 Chevy/GMC 3.0L Duramax or get the accessories you need for your tuner or programmer with OBDII Splitters & Accessories. OBDII Splitters provide a solution for setting up additional electronic accessories that utilize the OBDII port on your vehicle. Find the accessories you need for your tuner, programmer, or module including extension cables and OBDII port covers. XDP carries OBDII Splitters & Accessories from manufacturers like Bully Dog Technologies, Diablosport, SCT, and more!