Made in the USA To the highest quality, dont be fooled by the competition that makes everything in China! the Chinese have copied my products with the worst quality! ... take a moment and look carefully at the quality (the photos speak for themselves) see the comments of my 100% satisfied clients... More than 10 years in the manufacture of these exhausts from Florida USA. Note:This header does not have any kind of paint. Type of material: Mild steel, Uncoated Steel. Included: -Exhaust pipe. -2 Lock washer. -2 nut. -1 Gasket. 1/4" thick flange, 1/8 tubing wall, Heavy duty! 7" long (see photos for details) Pipe Diameter. OD: 26.86mm ID: 21.70mm Good for: Mini bikes, go karts, generators... multipurpose. Remember this is not a Muffler, is LOUD! This been tested on PREDATOR Max Performance 6.6 HP (224cc) OHV Horizontal Shaft Gas Engine