Restrictive Mufflers

Warlocks with the caps off do pass some serious gas.
Actually, the polished UltraFlos have a larger cores than their inlets and outlets so they pass over 100% of the air that a straight pipes can flow, at least the offset offset ones. Straight through flow even more.
The Hookers are likely very similar!
Not seen any Warlocks for a while but they were/are a cool idea.?
Tom