-Engine not included. Exhaust Gasket, 2 Lock washer, 2 nut included... 1/4" thick flange, 1/8 tubing wall heavy duty. 14" long (see photos for details) -Pipe I.D. 7/8 ... 21mm -High Quality -center hollow to hollow 1" 13/16= 46mm, Please check the pictures for measures and details before you buy it! Remember this is not a Muffler, it make a lot of noise when it accelerates! This is not legal for the streets! This Header is made especially for mini bikes! but also works in go kart. Weighs about 22oz This been tested on Predator 212cc (6.5hp) Predator Hemi. GX160, GX200. also tested on Powerhorse 208cc, DuroMax 7 Hp. (no tested on other engine) please check the measurements of your engine before you buy. (see photos for details) Made in U.S.A.