Rovan Baja Tuned Exhaust Pipe Set w/ Twin Tips

I love the look but as expected didn't fit my car (Maverick) It will need some adjustment. Looks like it will fit my standard Baja.

Support bracket didn't line up, had to use an extra nut as a spacer & even though it lined up good it still broke after the first run, the heat sink didn't come with it, lastly the main pipe that is welded onto the tank the twin pipes are attached to is leaking oil from the weld, for the price I thought it would be better quality. Does sound good though & look's the part but can't get past the holes in the weld allowing oil to run down the center of the first combustion tank.
Is there any way I can go over the alloy weld with something to stop the oil from leaking from out of the weld, or do I need a Tig Welder.