I tightened everything back down after the header install but when I'm going from Drive to Reverse there is a slight metal on metal sounding noise coming from the engine bay. Started doing it right after the headers install, almost like the motor isn't in the right spot. When I tightened it back down I basically centered the fan in the shroud (even space, about 1" on top and bottom) and then tq'd them down. Any idea? I don't think it's something bad but annoying.