Recommended only for 914 2.0L, 912E engines with big bore engines that is running at least 3/4 cam. Each kit contains two carburetors, cast aluminum manifolds, fuel lines clamps and all necessary gaskets (air filter not included). This special mounting hardware for the linkage arms is made from aluminum alloy casting that is much stronger and more rigid than a thin metal stamping. The throttle arms ride in individually adjustable heim (ball) joints for easier adjustment and smoother throttle response. Hardware & Fuel Line Not Shown.