A friend has a 2013 Boss and he wants to buy ARH headers with off road X-pipe. Currently the car has a full Magnaflow exhaust from the cats to the mufflers. Here is a link to exactly what he has, https://www.americanmuscle.com/magnaflow-competition-catback-1213boss.html . Question, will the ARH mid pipe slip fit with the Magnaflow over axle pipes????