Well I had been thinking of adding catalytic converter protection for a while, and since my rear heater lines started leaking I figured I may as well get it done. This is on a 97 with white knuckle off road sliders, with drop brackets, shorter length and the less aggressive angle. I had some perforated 1/4 inch aluminum laying around so that's what I used. I originally wanted steel so I could weld the sheets to the sliders but I'm much happier with the bolted aluminum. The sliders have two solid flat bars that I drilled and tapped 1/4 20 and used Allen button head bolts. I did not drill all the way through as I didn't want muck and moisture to get trapped. I will eventually buy sequrity button head bolts and use a split lock washer and anti seize for these bolts. In between the two flat bars there is a square tube, I did drill through one side of the tube and it was plenty thick to tap so I did not go all the way through. I also notched sections for the welds on the sliders. For the under section I cut and bent the same material drilled and tapped the same areas but also decided to use an existing tapped bolt hole under the chasis. That's pretty much it for the aluminum, please note if someone wanted to take the cats they still can. This is only half of the protection...more of a visual deterrent. Someone could still cut both ends and slide the cats out together. I will be finishing this off by wrapping the center of the two cats in 3/16 steel cable and attaching them to the slider with a threaded or through bolt. If people are interested I will update the thread with pictures after I finish. I figure once the cats are wrapped the worse someone could do is cut the cats and fail to remove them, a much cheaper fix.