The problem with making a car quicker and/or faster is that the amount of power to do so is not an even slope. In other words, if it took 100 hp to go from 13.00 to 12.00, it might take another 150 hp to go from 12.00 to 11.00. The changes you made aren't that drastic and IMO you'd be lucky to pick up 50 hp. I hope you run quicker but don't be disappointed if you don't.