Kawasaki Dual Intake, Boysen Extreme Velocity intake system includes Genuine Mikuni 44mm SBN Carburetors, Intake Manifold, Flame Arrestors, Flame Arrestor Adapters. All carburetor kits are assembled with RIVA Series or PROK Flame Arrestors, the filter size and shape that is the best fit based on the watercraft model. Please give us a note in the comments of which Flame arrestor you prefer. We will jet carbs for your application. Please give us all your specs in the notes section of the shopping cart at check out. I need to know what ski, what engine, any engine mods, what pipe, what impeller, and the elevation where you ride. * Note: These kits are special order custom built and are not returnable or cancelable once the build has started. Generic image and may not depict your actual kit. Carburetor jetting varies per application. Additional tuning will be required.