I found out today that the loud vibration at 3000 rpm is coming from the rear "wing" thing at the top of the hatch window that has the red brakelight in the middle of it. I don't know what the hell that thing is called. So anyway, i hit it with my fist, and it made the same vibration noise that the back of the car makes at around 3k rpm. So I'm pretty certain now that that's what I need to address. Incidentally there was no vibration really before I bolted on the Magnaflow exhaust. I think the weird angle that the exhaust hangs at is what's causing the vibration. But anyway. I need some ideas as to how to pad this wing thing so that it will stop vibrating so goddamn much. Any advice you guys can offer will be appreciated. Thanks.