This blocks-off the ACV (air control valve) port from the Mazda 13B-REW lower intake manifold. The low profile nature of the countersink stainless steel screws and anodized aluminum plate permits the necessary room for a secondary top feed fuel rail. Furthermore, deleting the ACV cleans up the engine bay by decreasing clutter and disarray.;NOTES;1. This is NOT a complete kit for removing the EGR system.;2. This product is to be used on offroad vehicles only.;3. This product does not meet emission standards and is not to be used on public roads.