Installed another spring project, I know of a few others who installed these products , maybe not needed on a street and non-tracked car , but not going to hurt and a little insurance against heat . Also installed cags skip shift ...no more annoying 1-4 shift. No harm that I can see in partially covering “cats” from heat they produce , an annoying smell from break-in with shields but disbursed in short time, shielded oil lines also