Proton Wira is also a popular car in Malaysia, with 1300cc and 1500cc come with 4G15 12V engine and 1600cc come with 4G92 SOHC 16V
engine, there are 1800cc edition as well with 4G92 DOHC 16V.
Anyway, there are a lot of owner still modified it
to MIVEC type of engine which comprise 4G9series, they may be modification in engine valve cover, intake manifold, but the cylinder head remain the same with various series may using diffrent type of material on their cylinder head gasket.
There are many type of material for this kind of cylinder head gasket which range from graphite(carbon), ceramic silicone and multi layer steel(come with various choice of thickness).