Big Block GX Exhaust Header Pipe

Exhaust header pipe fits GX390 and Predator 420, Duromax 440, and Wildcat 460cc engines. May fit other big block engines. 

Fits ports with a 28.5mm/1.130" opening 

Has two steps up to 30.5mm/1.120"

Pipe extends from flange about 57mm/2.245" on the inside of the bend

Pipe wall thickness is 1.26mm/0.049"

Pipe is 375mm/14.7" long