I pulled my plenum to replace my valve cover gaskets, and in the process broke just about every plastic connector (except for the injectors and coil packs) that you can imagine, but there was no way in hell I was going to spend $400 to replace a few broken plastic clips. Instead, I bought some hi-temp tape and wrapped them just to be extra sure that they didn't come apart. However, it probably wasn't even necessary because the connections are a bit snug as-is.