2. Remove Weight From Your Car
This is by far the easiest and cheapest upgrade you can do to your car. The weight is already there, so just strip it out. The lighter your car is, the faster everything will work. They say for every 100 lbs (45 kg) you shave off of your car you cut 0.01 seconds off your 0-60 mph (100 km/h) time. It will also improve handling and, quite literally, everything else about your car because you have less weight to tote around. The best part about it is that it is all free!