a friend of mine ran one i think he gained a couple of tenths on his set up. i haven't talked to him for a while though. it was a 572 nitrous motor drag radial car.last time i seen it run was a 8.63.
It seems from what i can find people have picked up depending on the horsepower.
$1200 smackers for it.
I guess couple of tenths is good if your already going fast. We know that it is hard to get a couple of tenths.