My exhaust buzzes around 3800rpm, so I went to remove the cat heat shield today. Removed all the bolts and got the bottom off. I put all the bolts back in to hold the top down since It looks like cutting is required to remove it?. This helped the rattle a little, but not totally. How safe is it to remove the top part of the cat heat shield, will it heat up the underbody of my car any more? Also, is cutting needed to remove it, or do you just have to angle it right to get it out? Thanks!