i had an idea on a header that i havent seen yet.. the idea to me with the shape of the tubes seem to be logical, but... what all goes into building a custom header that can compete/ things like tube size bends and so forth that effect performance? im a noob when it come this fabing but one day im looking to get tig and mig and starting to practice.

 

There is a thread of somebody doing this same thing on THIS page. Take a few moments to search and you will find your answers.

 

primary length, primary size, collector design, collector length, collector choke size, length of piping and size after the collector.

good luck.