The 4age TRD head gasket is an inexpensive and easy upgrade to give your 4age a little more power. This head gasket has a stock size 82.5mm bore and increases the compression ratio about half a point (0.5) and works for both the 4age and 4agze. When compressed, this metal head gasket measures about 0.8mm while the OEM head gasket measures about 1.2mm. This difference in gasket thickness is what slightly raises the static compression ratio. The is a genuine Toyota TRD OEM part.
0.8mm thick when compressed
Made from MLS by TRD
This gasket does require machining to the head and possibly block to ensure flatness for proper sealing.