no rust anywhere on the system at all. muffler has none and along the pipes at the resonator and at all the bolt "joints" there is none as well.
there was a slight vibration at first, however it was the heat shield and not the Greddy. I think the heat shield vibrating is common with most aftermarket exhaust. You can either "reshape" or bend the shield or I just removed mine completely. There are a couple of smaller shields as well (one directly above the cat). Best thing to do is jack it up or take it to a shop with a lift (where I purchased my exhaust) and have a friend rev light and hard to find the spot. Best to wait until AFTER the car has cooled down to remove anything though. Risk burning yourself or stripping a bolt (easier when hot).