The maniflow went on without many issues. I bought 3, 45 degree angle bends. Two were used for the down pipes, which were far too long and hung down beneath the van. these are tucked up nicely under the van. The down pipes then went into a Y piece borrowed from a mini. This then went into another 45 degree bend and then straight into the maniflow back box, exiting just in front of the passenger side rear wheel. It is noisier, but not that much noisier (says deaf lad!!!)
http://i16.photobucket.com/albums/b25/katiebf/IMG-20130310-WA0000_zpsc08d35f3.jpg