Add functionality to the OBDII port on your 2011-2016 Chevy/GMC 6.6L LML Duramax or find the accessories your tuner or programmer needs with OBDII Splitters & Accessories. Extension cables for tuners, programmers, or modules, along with OBDII covers, are available for a variety of applications. When adding multiple electronic accessories that use the OBDII port on your vehicle OBDII Splitters are the solution you need. XDP carries OBDII Splitters & Accessories from manufacturers like Bully Dog Technologies, Diablosport, SCT, and more!