Unlike other manufacturers of diesel performance products that increase turbo charger boost pressures, ours achieve their power gains by strictly altering the fuel injection timing and duration.

Power output Series
120 kW 163 HP 400 Nm 294 lb-ft

Diesel Power
144 kW 196 HP 480 Nm 353 lb-ft

Q: Are there any pre-existing condition that will affect performance or lack of with my new Dieseltuning module on my VW TDI?

Intake Manifold and EGR Cleaning - This vehicle is equipped with a CCV (crankcase vent) system and an EGR (exhaust gas recirculation) system. Oily fumes from the CCV system can combine with carbon particles from the EGR system to form a black sticky tar in the intake system. This eventually starts restricting the amount of airflow into the engine, resulting in gradual power loss as the vehicle ages and the intake clogging becomes worse. In rare cases a MIL ("check engine" light) may be tripped, with an intake manifold pressure control code set, but normally this does not happen and no codes are set. Operating conditions, fuel quality, oil quality, driving habits, and general condition of the engine all have some effect on how long the intake system survives before clogging up.

I've had this module installed on my KJ for about 4 months now. It works great!
On setting 'C' I have to be careful not to spin my precious 245/75 MTRs, and that's on dry pavement. There is alot of tourque there, and when you lay off the throttle, it gets better milage as well.
I have to say that I don't know as much about that though, because it's a little too fun getting into the throttle.