This is specially designed for… Harbor Freight Predator 670cc V-Twin… What is included in your order?2 Exhaust, right and leftHigh quality hardware ( You can use the original nuts on your predator 670 too!)-Type of application Universal (Example) Tractors, Generators, Go Kart etc. Exhaust flange is CNC cut 1/4″ thicknessType of material is mild steel (((Sandblasting plus 2000F high heat primer has been applied)))>>>You can use it as is or paint it any color you like, I recommend 2000f paint. OD of the tube 2″ muffler / 1.25″ Muffler (Exhaust is a solid piece along with the muffler! Made in the USA (Top notch quality!ENGINE NOT INCLUDED. Fast shipping from Florida!