Custom designed for use with the IMCA Modified 604 Crate Motor.
Features three steps, from 1 5/8 to 1 3/4 to 1 7/8 and a 3" Collector.
Drivers side header will be over the frame rail.
After dyno testing several different types of headers, we know that these will get the most out of the power of your 604 Crate Motor.
The one-piece design makes installation easy. Will fit Jet Mods. May fit Razor, Harris, and BMS.