Regarding Samurai_Blue's comments about more shock travel... more shock travel does not make you faster unless you had really soft springs and a low ride height that was allowing the car to bottom out while turning. It's not shock travel that helps you there, it's suspension travel. In all cases, lowering a car from stock height and adding stiffer springs will make it faster. The car will be quirkier and will not be as forgiving, so some people may have trouble making it quicker like that. Over time, a driver should be able to interpret what the car is doing in handling maneuvers and act accordingly. With enough seat time, a driver will be able to get more performance out of a car that is stiffer and more responsive to inputs, even though those changes also make it less forgiving to mistakes.