The thing is Daz that applies to all headgaskets. They rarely fail when subject to lower boost but theres always so much boost thats effectively the straw that breaks the camels back.

So far every cometic gasket I've used has failed in one way of another, and I have had NO mountune gasket fails.

You only have to look at the rest of the gaskets in the cometic set to see you're dealing with gaskets that make atomic gaskets seem like real quality, that can be bought from your local motor factors for around £10 for the full engine set!!!

The worst one of all is the exhaust manifold gaskets in the cometic set. Shocking is'nt the word!!!!