2018 Jeep Grand Cherokee Trailhawk, 5.7 L, V8 What we have done: 📍 Unlocked the PCM. 📍 Unlocked the Factory OBD Port. 📍 Removed the Speed Limiter. 📍 Disabled MDS. 📍 Optimized the Throttle Body. 📍 Optimized the Spark Table.