Here is the results of a 2008 GMC Yukon that has the 5.3l displacement on demand engine which GM spec's at 320 HP with 340 ft/lbs torque.

Totally stock except owner installed our 3D smart controller with water/methanol injection and we custom tuned the PCM and the TCM for the A4 trannie.

We adjusted when PCM would command 4 or 8 cylinders on/off
Performance gain was 395/395 Hp/Tq