Engine Masters is, just like Roadkill, becoming a bit of a favorite show of mine. David Freiburger and his partner in crime, Steve Dulcich, are great at explaining how changing out headers on an engine without changing anything else in regards to airflow can have either positive effects, or detrimental effects. In this case, going to a larger header does have a benefit when performing at peak RPM, but going too high can mess with the power curve and even reduce peak power. Watch above, and learn a few things. It’s worth it.
-Albert S. Davis