Hey I'm having a problem with my son's 2010 impreza. We replaced the pullies, timing belt, water pump, etc. But in the midst of trying to tighten the harmonic balancer nut, we were told to just stick a big screw driver down the access point on top of the engine right near the point where the engine connects to the trans. Well we did that, but a plastic shroud in there bent and now drags on the flywheel, making his vehicle sound terrible but it runs great. So my question is this - what is the plastic piece? His car is an automatic.....is it just a cover like a pressure plate or something? Am i going to have to remove the trans to replace? Is this plastic piece vital to car operation? Help!