This kit includes top quality items inlet and exhaust manifolds, RC40, K&N filter element, all gaskets required and a correct new needle for spring biased HIF38 or HS4 1.5"carbs only. See C-STN18B for same kit but with centre exit exhaust. For HIF6(HIF44) carbs see C-STN18A for correct kit as this needs a 100 thou tube jet needle.