Headers vs. Exhaust Manifolds ~ 'Let The Debate Begin'

Headers 'Advanced Basics'

* Small Tube
* Medium Tube
* Large Tube
* Extra Large Tube

Formula
Cylinder Scavenging + Combustion Effects - Back Pressure {Slight Reduction}
= Increase in Horsepower

> Small Tube {1 1/2"} = Higher Torque at Lower RPM's
Creates good mid-range power, but falls off the table at Top-End.

> Medium Tube {1 5/8"} = Power at Mid-Range RPM's
Best 'general' performer at Mid-Range, with good early Upper-End Power

> Large Tube {1 3/4"} = More Torque at Higher RPM's
Higher RPM's, at the expense of Low-Speed Torque.

> Extra Large {1 7/8" or 2"} = Race-Type Headers
Designed for High-RPM Engines, and Big-Blocks.