Folks, I was wondering if y'all could give me some advice on which would be the best inner firewall cover( 47-53) I know it's mainly about heat and noise reduction. For instance, J. Carter's firewall cover is a fiberglass reproduction, while Classic Parts of America offers a cover that is molded in ABS plastic. Both covers have the pad attached to them. There seems to be only a slight difference between their prices, although Classic Parts' cover comes with pre-cut holes. your thoughts on this? Thanks in advance.