SR20DET Head Gasket
APEXi SR20DET Metal Head Gasket
APEXi Part Number 814-N108 Gasket Bore Size: 88mm Engine Bore Size: 87mm Metal Head Thickness: t= 1.8 Compression Ratio: 83
Factory SR20DET head gaskets cannot withstand the pressures of high output operation and often cause the engine to “blow.” This condition is actually caused by a failure in the factory SR20DET head gasket. A’PEXi recommends replacing the factory SR20DET head gasket with a metal head gasket.
http://store.drifting.com/apexi_integration/apexi_metal_head_gaskets/814n108/i-35864.aspx