[n4mwd]

You asked the wrong people. You need a welder to weld the bungs on - not a bike shop. I used oxy-acetylene myself, but a pro would probably tig weld it on. I would stay away from arc or mig because it needs to be air tight. If you have the bung nuts ground to a concave surface so that they fit snugly to the header pipe, then just drill the hole in the center so that the welder can see exactly where it goes.

Something like this is like a $20 welding fee if you bring it ready to weld, but they could have a minimum charge that could bring it up.