Relevant to the thread:
Maybe not so relevant but I argue it probably still is relevant:
I've just fitted a Sprint Booster to our 3.2 V6 KL Cherokee Trailhawk.
It has transformed the whole driving experience and made us fall in love with our TH all over again.
I understand entirely what SB does and doesn't do.
Clearly I didn't get it to try and do what it doesn't do - being an aircraft mechanic and having spent $$$ modifying my EF I6 falcon - including custom camshaft, porting my own cylinder head and custom tuning the engine AND transmission - I have SOME real life first hand and very successful experience how all this stuff works.
But what it does do is amazing even when you theoretically know what to expect.
It DOESN'T give the engine more power than it's factory 200kw - but what it DOES do is let you use pretty much ALL of that 200kw instead of only about 150 of it... I challenge Sprint Booster's own statement that it won't improve your 0-60 time, because there is no way you can get to 60 (100kph) as quickly with the factory programmed accelerator behaviour as you can with SB turned on. Like I said, no more power but with SB you get to USE all of it.
The factory programming doesn't just affect the proportioning of accelerator input to throttle actuator movement, it clearly also changes RATE response according to mode and god knows what else. There must BE something else factored because that's the only way to explain how damned inconsistent the factory accelerator behaviour is.
On top of the confusion of factory programming that yields different behaviour in different circumstances, they also IMO simply got it wrong - period.
SB fixes it - PERIOD. You press the pedal and the car GOES - and it does so consistently ALL THE TIME regardless of weather, car attitude, bitumen or dirt or rock or sand. No more quick prayer before trying to merge or overtake or enter the next goddamned nightmare large multilane roundabout that REALLY should be traffic lights.
I can now, though! 
