I posted on this quite a while ago but I've seen it come up a few times and had some emails about it, so I'll post it again.
For anyone who thinks their 49 blower doesn't throw the snow far enough, try changing the driven sprocket (on the auger) to one with 4 less teeth than what is currently on it. This is the equivalent of the 10% speed-up pulley on the 50" decks. You'll get around 8 feet of extra distance on the snow and probably notice it doesn't plug up quite as easy with heavier snow either. It puts slightly more load on the engine, but nothing serious.
I did this to mine last fall and now I don't have to throw the snow twice just to clear the driveway.
