ISR Performance OE Replacement Turbine Inlet Gasket (4 bolt) - Nissan SR20DET RWD S13 ISR Performance is proud to offer OE Replacement Gaskets. With great success of our other OE replacement parts ISR Performance has become determined to provide more and more high quality OE Replacement, hard to find JDM Parts. Multi Layer Steel Gasket ** All ISR Performance Products are Designed for Off Road Use Only **