Bump for updates.
Has anyone seen a long 3-3.5" high-flow cat? I think something like that would work well as a replacement further down on the pipe, as some people (me included) have to pass rigid emissions testing. EDIT: like these Universal Fit Catalytic Converters from Random: http://www.randomtechnology.com/products.html
Additionally- does anyone know the cell count (density) of that stock cat?