you can make good welds with a mig, but its hard to go around such a tight circle with a mig and keep the right gun angle. Anyone that has done a bunch of welding or has welded as a career will tell you that you cannot make a part that is welded with a mig look as good as with a tig. Plus if you do get a tig you can advance to making other parts.
Would this fit an SRT-4?