Our JL Performance Intake Manifold Ribbon Delete Upgrade Kit enables your Yamaha Waverunner engine to produce more horsepower by delivering increased air flow and boost pressure. The sleeve directly replaces restrictive mesh element in the intake manifold to provide improved air flow in the mid-range pull through quick & easy installation. Made from CNC aluminum construction. Our kit comes complete with everything needed for the installation. The only additional tool required is a 2 3/4” hole saw for the installation process.