I think you might be right there Pete, that particular area on the pipe does look different to the rest. Hard to explain really but I'd imagine it's either from the coolant or from the welding.
The chemical metal will only be a temp fix as I need the car for the beginning of next week, as soon as I can get hold of a new set of pipes I'll swap them over. I suppose the current ones could possibly be welded and fixed, hadn't really thought that far ahead
Do it properly Dan, don't save at the wrong end