[bimmerboi318]

There are two bolts and two nuts that bolt the catback to the back of the cat. it's just a flange and if the bolts break (which they most likely will), they will just fall out. I dont think there's any need for drilling. Break the heads off and pull the old exhaust. The hangers fit a bit snug on the old exhaust, but a good prybar will make quick work in popping it free. The Stromung fits on the old hangers VERY easily because the ends of the brackets are bent instead of mushroomed to keep it in place. On a lift the exhaust took me about 25 minutes to replace. If you're on the ground, it will most likely take longer. Overall, it's worth tying on your own.