If you still have the factory cats, I personally, would not because of the heat. I might expect the clear bra material to "yellow" as does some of the clear coat paint colors. I run the factory cats, but aftermarket mufflers and the muffler area, on my car, would be no problem. The cat area gets awfully hot and I added extra insulation to boot. Of course, I live in an "inferno" for 4 months of the year.