whats the rule of thumb as far as weight reduction vs. effective horsepower gains. I have started a major diet and am wondering how crazy I should get. so far its lost:

rear seat
passengers seat
all seatbelts but drivers
abs modultaor and electornics (about 30 lbs or so)
sound deadening under rear seat
spare tire and jack etc.


The rear three windows are flat glass which means I can go plexi/lexan fairly easy just curious how much more of a gain I could see without having to go out and check my pant seat meter which is feeling off lately due to the gearing not being quite right currently.