I have the Mac high flow cat system with Flowmaster cat back system on my 93 Mustang. The beauty of the Mac system is you can unbolt the cat H-pipe and put in an offroad H-pipe right? My system has 2 hangers welded to the Cat part of the system. Mac Tech' told me that is the old system. The hangers are on the long tubes now connected to the stock headers. I just want to be able to swap out the Cats to the off road when I have to take a sniff test. I think I have to buy a whole new Off road system to get the hangers in the right place. Any Help?