For those that choose ease of maintenance along with performance gains, the single 40/44 IDF is the set-up of choice. For the basic 1600-1800cc, the 40 IDF Kit is a torquey option. For all out performance, the way to go is the 44 IDF. Both carb. kits come with an assortment of jets to tune your carburetor. EMPI also has available a selection of jets if your application requires further dialing in. Complete kits feature Aluminum Center-Section Manifold, Aircraft Style Heim Joint Linkage, Chrome Air Cleaner with gauze element, gaskets and hardware. Complete with detailed illustrated instructions and attractive EMPI packaging. Fits Type 1 1600cc based upright engines. (Requires P/N: 3236 dual port end kit or P/N: 3237 single port end kit)