prevent

Been running a high level Spark exhaust on my RC but because of where it sits it's melted through my waterproofs, boot and anything that comes near. Looking for some sort of shield, wrapping or guard that will prevent this. Hopefully the pictures are self explanatory but anyone got any thoughts...

What’s the cause of the blown gaskets? Is there any check that could be done to prevent it? It looks like when it happens the damage is all over, cylinder, piston, valves, head. Does anybody know the estimated cost of rebuilding the engine from that?