The Coleman Engine Parts are Made of Aluminum Alloy with Smooth Surface for Improves Air Intake Efficiency. NIBBI Strengthens the Intake Manifold to Resist Corrosion and Robustness,Guaranteeing Motorcycle Stability. Vertical Shortening of Predator Engine Parts Reduces Intake Resistance and Accelerates Full Combustion for Optimal Rpm. Flange Design Reinforces Coleman Performance Part Seals to Solve High Idle and Weak Acceleration Issues. The Coleman Intake is Precision Engineered with Sealed Round Port,Carburetor Intake Rubber Boot Inner diameter is 33mm，The hole distance of the flange is 42mm，Perfect for NIBBI PE/PWK 24 26 28 Carburetor Install and Enjoy a Performance Boost. NIBBI Coleman motorcycle intake manifold