collector extensions and improved ET'S

18'' seems to be the sweet spot for most. Worked for my Big Block and Slant Six cars.
Yep the old school way was to paint them and look for the burn "ring".The only thing that I have to add is (this dates back to the 60's) is cut at the ring for a 4 speed and 1 inch longer for a automatic.Maybe a old wive's tale ??.

Anybody remember the old Hooker adjustable headers ??