How much hp does hedman headers have?

Hedman headers themselves do not have horsepower; instead, they are aftermarket exhaust components designed to improve engine performance by enhancing exhaust flow. The actual horsepower gain from installing Hedman headers can vary depending on the vehicle, engine type, and other modifications, typically ranging from 10 to 20 horsepower. To achieve optimal performance, it's essential to pair headers with a proper exhaust system and tuning.