Going with RedThree on this one. One of the easiest solutions is to tighten the exhaust nut on the bottom side after loosening the upside a bit. This will swing in the curved manifold closer to the body and will increase the amount of space at the rear of the guard. Then tighten everything back down.
During driving season I go over everything I can reach and tighten. This car wants to vibrate itself to pieces...
