I'm little confused about my intake size, I received my complete gasket set yesterday. there were two intake gaskets. looks like one is 30mm and the other one is 40mm, so which one do I need. the 30mm too small.the other one was a bit too big, so I customized it a bit. so it seems to fit well now, plenty of gasket coverage. is this normal for a china doll? I still don't know what size my intake is.