Do yourself a favor and quick call a muffler shop in your area and see what they will charge for hi-flow cat and the install. In my case, I found that the local muffler shop (a good shop) will provide a completely installed hi-flow cat for within $10 of the cost to order, pay for shipping, wait for delivery, then find a shop that is willing to weld on your cat instead of buying one there.
In my experience not all shops are willing to weld on a part you bought somewhere else. If they do, expect to pay $45 - 85 US for the labor only.
Mike: 1997 SE w/ 183K, aka White Horse
, Gutted Airbox w/K&N, drilled 180* t-stat, tint all around, clear corners w/SilverStars, "PONTIAC" light up tail, PEMs, NGK TR55s