I think that the V2 makes a little more power (2-4hp max). It also has a larger diameter piping at the bottom instead of being the same diameter the whole length of the pipe. I have had the regular version on three different cars and they have been great. Make sure that you get the bypass filter to prevent the water getting into the engine in the event that you would hit a puddle. I would probably just get the regular version if it were me.