I just want to tack a quick question on at the end of this. It sounds like the primary cat is clogged. Did I once read from someone here that you can take the primary off, replace it with a 3" header flange and splice the o2 wires on the secondary cat sensor to fool the computer?
I hate cats.......more of a dog person! <img src="/forums/images/graemlins/shiner.gif" alt="" />

2000 KIA Sportage 4x4, Sadly Smushed! Now a 2001 Cheep Jerokee. 3" Rough Country Lift, 255/70/16 General AT2's
http://www.cardomain.com/ride/2292811