I saw a V4R on a car at Reynolds this year, and it looked dangerously low for speed bumps. I don't know the measurements of it though. I believe that I've heard that both the V4 and the V4R have the same scoop inlet locations, but the scoops are different in that the V4R sits deeper into the scoop than does the V4.
Turbo Mike has a great deal of installation experience and knowledge of the V4R from what I've read here.