What are four ways to make your stock sedan even faster? Kyle Petty:

1. Change your spark plugs to a higher grade. They'll burn hotter and faster, and will prevent residue from building up.
2. If it's not snowing outside, use thin oil. I like 10W-20.
3. Buy the highest-octane fuel you can find. Try buying a tankful of the really premium juice at a local racetrack.
4. Rip out the backseats.