Gain control over the throttle response, tire size, gear ratio, TPMS, and your speed limiter in your L5P Duramax. The Pulsar LT In-Line Module offers complete adjustability of all those parameters right through the steering wheel controls. This in-line module can also command a manual DPF regen cycle, automatic transmission relearn, clear DTC's, and engage engine high idle all while leaving your truck's warranty intact.