This muffler assembly is for the 196cc 6.5 HP JF200 engine found on all versions of the Baja Mini Bike (Baja Heat, Mini Baja, Baja Warrior) It is compatible with both the MB165 and the newer MB200 models This muffler assembly is for the 196cc 6.5 HP JF200 engine found on all versions of the Baja Mini Bike (Baja Heat, Mini Baja, Baja Warrior). It is compatible with both the MB165 and the newer MB200 models. This mini bike part includes the muffler/exhaust heat shield. Mounting Hole Diameter: 9 mm Mounting Hole Distance (Center to Center): 45 mm Exhaust Pipe Inner Diameter: 19 mm Heat Shield Overall Dimensions: 130 mm wide x 105 mm deep x 67 mm high