Very possible, all my kit is production and I've done 35 knots.
As said above, flat water and rigging big is your friend.
The first time I took a GPS out I was on a 105 litre freeride board, with a 7m sail. I kept on doing 26's until I changed my fin from a 30cm to a 37cm -- then I started doing 28's. A couple of runs later I'd cracked the 30
This surprised me, because I'd thought that the smaller fin would be faster than the bigger fin.
So the key for me was experimenting with my setup, and keeping an open mind about what changes to make. With a GPS it's a lot easier to figure out what makes you go faster. Don't be afraid to change mast foot position, boom height, outhaul, downhaul, fin size, strap position etc, but be sure to do three runs on any setup before you make a decision as to whether or not it's faster than any other setup. And only change one thing at a time!
Probably the first things to experiment with would be outhaul and fin size. Muck around with these for a couple of hours and pick the setup that gives you the best speed, then start experimenting with other stuff.
I just can't get my head around that 
