How about you stop gutting your car so it doesnt look like shit and get some more HP/TQ. more HP/TQ=FASTER. unless its for track only sure then gut it. But if its not why take the wiper motors out what if it rains!!!... seriously as i said before the rule of thumb is .1 for every 100 pounds so you need about 400 pounds off your car to feel a nice difference...
ps taking the bumper supports off is a stupid IDEA there their for a reason more protection if a accident occurs, but if you dont care might as well remove the air bag/s and seat belts, im sure that would be a noticable gain(not).