Mine has the same problem, but the cat is not the main problem. I'm losing pressure in two of the cylinders which puts me at 50%+50%+100%+100%=3/4 power.

homerdog great article. I'm going to try that too. Maybe I have a plugged cat too, but the leak down test I did revealed bigger problems up stream.

Logansportage <img src="/forums/images/graemlins/patriot.gif" alt="" />

White 1998 4 door KIA Sportage 4x4 w/Eibach 2.5 spring lift and TJ rear coils, 4crawler 1.5 body lift, Monroe Sensa.trac shocks, Bosch 4+ plugs, Eaton LSD, 31x10.5x15 BFG KM tires, 2.5 cat back exhaust w/SpinTech muffler