Performance stage 1 kit HS4/HIF38 1275, includes  inlet and exhaust manifolds, twin box exhaust, K&N filter element, all gaskets. Comes with the correct needle for the larger HIF6 carb 1.75" which has a 100 thou jet tube, an alternative to the needle supplied is BDL if other slight modifications or exhaust changes have been made. Always get your car rolling road tested for best ignition/timing and emmissions after fitment.