Header Primary Tube Selection for Powerbands
Primary diameter, length, and collector choices for drag, circle track, and hot rod builds.
Primary diameter and length shift where torque peaks. Larger, shorter primaries favor high rpm; longer, moderate diameters help midrange pull for dirt and street.
Collector design and merge quality matter as much as tube size. Leaks and crushed tubes kill power you already paid for.
Always check chassis clearance, starter, and oil pan before you order. Fitment notes on our product pages are the first filter — Call Us or Ask Grok with year/make/model for a second pass.
External education hubs (for example MotorState tech articles) are excellent for deep theory. We publish original build notes here and keep shopping + fitment coaching on Cunningham Customs LLC.