This is a 12 gauge, CNC laser-cut stainless steel Oil Metering Pump (OMP) block-off plate for the Series 4 (86-88) 2nd gen RX-7. 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). DO NOT install this block-off plate unless you have an alternate means of lubricating the engine internals (i.e. pre-mix). DO NOT install this block-off plate unless you have an alternative means to lubricate your engine internals (i.e. premix). Product intended for off road use only.