Ejohnson, why do you think people lighten their car? Lighter car = faster car
It's facts, it's not belittling the car. If you take that same motor and put it in a 3,200-3,500lbs car, guess what. It's slow as balls.
Lighter car also means less strain on the drivetrain and EASIER to put the power down. You need the proper suspension setup and tires for everything to work in harmony though, but lighter will always mean faster.