I just ordered the NMN 4" riser. I read that you can't use the Corbin fairing with the NMN riser. However, when I contacted Corbin, they said it would work and they use that set up occassionally. Does anyone else have experience with this set up--does it work? I am not sure whether to buy the Corbin fairing (expensive) and run into problems with the risers. Frankly I think the Corbin looks more finished than a large piece of plexiglass--but that's just my opinion.