Ok so I noticed that the top of the heat shield underneath the car where the CAT sits has disintegrated away. It’s about a 4 inch by 3 inch piece that’s no longer their. The rest of the heat shield is relatively in fair condition. Do I really need to replace it? Or will it cause me problems if I don’t. I just bought a new CAT and exhaust, so I really don’t wanna spend anymore money unless I have too.