| Here's a photo I found on the forum that shows the HPF exhaust setup. If u look at the connection from section 1 to 2 the Y could be cut out and put a cat in that section. There are several slim stainless cats that could be squeezed in to the stock section 2. The setup pictured has an aftermarket single pipe for section 2 so a 3 inch cat could be dropped in. The only issues is that far back the cats may be rendered ineffective as the heat may not be as high that far back to burn efficiently. I know that Proefi has a module that mimics sensors so u don't throw any lights. It may only work with their system not sure.
"Horsepower is how fast you hit the wall. Torque is how far you go through it."
Last edited by being3; 01-19-2013 at 04:16 AM.