HP Tuners 2020+ 6.6L Duramax Unlocked T93 TCMHP Tuners Unlocked T93 TCM Required to load custom transmission tuning. Note Sending your core in after receiving your order will result in an upfront core charge amount of $300 to be refunded upon the return and inspection of the core Damaged cores that do not comply with manufactures core return guidelines will not be refunded Return Core Shipping Costs are at the purchasers expense