That was what I was going to say... If the pre cats are clogged, gut them. Cut out the main cat and leave it out, or if you have inspections get a high flow cat from any of the contour performance stores. You should only replace the 2 O2 sensors that are before the pre cats, as they help control mixture. I am not sure if 98's have 2 O2 sensors after the pre cats, but either way, put some eliminators on them and you will be fine! Total costs: 2x O2 sensors - $130
High Flow Cat - $100
Gutting pre cat - $10
Total cost of about $250 to have not only a fixed car, but a better performing one! There are alot of threads started by me about gutting the pre-cats that have alot of good information about the emmissions systems, search about gutting the precats and you will find alot of info on this... -Nick
