You might also have to adjust the clamps on the mid pipe and then rotate the over axle pipes slightly. I had to do that to help clearance issues with the Muffler and the hanger bracket (rattling).
I had to fiddle with that a lot to get it centered on both tips properly.
2011 Black Mustang GT Premium
Corsa XO & Sport AB/Airaid/Bama 93R
Best 1/4 mile to date 60' 2.009
12.538 ET @112.33
100+ Deg 85 Hum RPR 3PM 1/2 tank street tires