Word of warning, depending how low your van is the Python may not be suitable.
I originally went down this route prior to having a Turbo Thomas exhaust made. As you'll see from the photo the silencer sits very low and I wasn't prepared to have it ripped off. Before you go to the time and effort measure the distance between the ground and the engine support bar and knock a couple of inches off.
If you feel you've go enough clearance then your ok. If not you could get it modified to sit higher which I did consider for a while as per this thread.