The newer version of the V&H Propipe does not perform very well whereas the older version was a great system. Depending on what bike you have I would steer you towards the D&D 2-1 options or even the V&H Competition Series 2-1.
If you are looking @ V&H we would recommend the Competition Series 2-1 and not the Pro Pipe 2-1. The competition series 2-1 has a triangular look at the pipe end whereas the pro pipe has a round end.