I just saw in another post where Brad Noon has gutted (and cleaned!) pre-cats available for like $100 with core exchange. A good deal IMO, as this is a dirty and tough job under the car and on the bench. Brad really knows these pre-cats... Gains are terrific, although I'm not sure about 11HP?? Probably an easy 5 or so, but it depends on other restrictions in your exhaust. If $100 wont crimp your tail pipe, buy the pre-cats instead of doing yourself. If you have emmissions testing, you'll need to keep the main cat on.
