I bought the non-resonated with the magnaflow. As far as I'm concerned, most mufflers (of the square ones) are basically the same in dimension. I installed my exhaust myself and there is plenty of room for the muffler to ft, there is even more room to use if I needed it. I'd go and check it out for youself, because these are custom made exhausts, made to fit the Contour. Maybe they are retarded and are putting it in wrong, or maybe they are going to try to charge you for doing extensive modifications. Like I said, go and look for yourself. If they say no, then do it yourself. Providing you have jack stands, and the 2 bolts on the flange (after the cat) come off easy, It shouldn't take more than 1-2 hours. That includes the time needed to straightening the tips out perfectly.
