No Limitz JL is a breakthrough design that allows full output without any permanent modifications Disables factory speed limiter (stay within limits of your tire rating) Disables speed and torque limiters in 4 low Disables torque management system/traction control Disables MDS system (392) Allows FULL POWER in 2WD on 4XE It can be turned on and off at any time Simple plug-and-play installation Silently overrides speed limiters and torque management No permanent modifications Nothing in the vehicle gets reprogrammed Cannot be detected by dealer tools Finally, a way to override the speed limiter without unlocking the PCM and voiding the warranty! This little device leaves the PCM alone, so there are no warranty issues and no dreaded P1400 code.