Add functionality to the OBDII port on your 2006-2007 Chevy/GMC 6.6L LLY/LBZ Duramax or find the accessories your tuner or programmer needs with OBDII Splitters & Accessories. When adding multiple electronic accessories that use the OBDII port on your vehicle OBDII Splitters are the solution you need. Extension cables for tuners, programmers, or modules, along with OBDII covers, are available for a variety of applications. XDP carries OBDII Splitters & Accessories from manufacturers like Bully Dog Technologies, Diablosport, SCT, and more!