9. Upgrade The Exhaust System
Investing in a free-flowing exhaust system may be able to boost horsepower by five to 10 horsepower. Supercharged vehicles may experience an even greater increase in horsepower. A free-flow exhaust system may improve engine performance by providing the least restrictive gas flow possible. The oversized piping of the new exhaust system will not affect back pressure. Instead it will lead to a more free-flowing system that improves efficiency in most vehicles.