This is a 12 gauge, CNC laser-cut stainless steel Oil Metering Pump (OMP) block-off plate for the Series 5 (89-91) 2nd gen FC and S6 (93-95) 3rd gen FD RX-7s. Turbo and non-turbo cars use the same block-off plate, which goes on the front cover. Use a stock OMP gasket and/or silicone gasket material underneath for a positive seal. DO NOT install this block-off plate unless you have an alternate means of lubricating the engine internals (i.e. pre-mix). Product intended for off road use only.