Installed another springproject, 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 ācatsā from heat they produce , an annoying smell from break-in with shields but disbursed in short time, shielded oil lines also