well a few days ago my entire exhaust fell off th downpipe. its loud, backfireing and just obnoxious. i went to a friends who told me he could weld the new cats on for me but apparently couldnt. so im going in hopefully tomorrow to get the cat welded in. heres the run down, i have already cut off the old cats, theres a 18inch gap between the downpipe and the rest of the exhaust, i have 2 magnaflow universal cats, the factory piping is 2 inch diameter, the cats have a 2 inch diamtere, anyonw wanna let me know how much im looking at to have it put on.