Another option is, with Soooo many members changing their back boxes for Monza's or aftermarket items there are alot floatin about with low mileage and its always hard to know what to do with em.
Mine came off with about 3k put on it, dry use only, tailpipes always cleaned n polished every week and looks like new but is now sittin in a massive G-Tech cardboard box in the missis's spare room lol