Depends on the quality of the decomp plate. Ferriday has an excellent reputation and i had no problems with the fitting technique which was to place it on top of my original gasket and Elring sealer between the head and decomp plate itself. It would just become an extension of the head in effect. But it was recommended that i should re-torque the head bolts after a few miles which i'm not keen on.

Wire ringing is a process where a groove is cut into the block face (or sometimes cylinder head) for a piece of wire to be inserted, in my case, 0.6mm welding wire. The protrusion of the wire isnt very much, but what it does is dig into the fire ring of the headgasket and once fully clamped down means virtually no risk of the head gasket blowing due to higher boost. For me i had no choice as an uprated gasket such as a tri-metal layer item is not available. Ford boys will have a better choice however so unless your going for really silly boost its not needed.

Here is a picture of my block showing the wire rings installed to give you a better idea.



hope this helps

Gareth[/img]