Update: When I first installed the cover and was putting in the replacement bolt at the back valvetronic motor bracket I was really impressed but later was worried that maybe since the aluminium cover doesn't have the same give for expansion as the plastic that maybe it was a mistake to tighten the back bolt. I was going to leave it out and then I thought maybe I would just leave it snug and use some blue loctite on it but then thought I was probably overthinking it and just left it tight. Well yesterday the check engine lite came on with a reduced power warning and I thought 'o crap the water pump again,' but turned out to be a code for sticking valvetronic motor! Maybe I wasn't overthinking after all. So did the 'leave the back screw barely snug and blue loctite' and will see what happens.