No only one (1) Cat Convertor exists, The core drill deal just removes the portion of the cat in front of the rt side muffler, the rest as show in the above photos remains if you use a core drill. I bought a RK header and had it coated but I think a core drilled pipe would be fine, most of the flow goes to the rt anyway due to path of least resistance. And really after all the discussion/opinions all the baffles in the aftermarket exhaust are the same, a pipe with perforations poked into it and packing, that will eventually burn out, wrapped around it. Fullsac & Reinhardt baffles are vitually identical, Had both out last weekend side by side. If you scour the dyno charts, hp may vary by 3 or 4, this is probably due to location/operator (read human) error. Don't sweat the pipe thing, do what is easiest, just remember to keep it quite as you can, cities are getting tired of us!