there should be but your really not gonna feel 3-5 hp it is so slight that you really cant tell. and if the peak is right when the turbo spikes and you have wheel spin you really wont tell that and the traction control messes with the power too.(hump)
another thing you have to take in consideration is where the extra 20 hp is at. like if it is right when the turboe kicks in at 3000 rpm then you might not feel it as much cause it is peak hp and that's the high point of the hp increase. now after you look at the dyno if you get it done then you...