I'm now getting a pretty decent wave for my '13 OBV with the following config:

- 900# ballast in rear lockers (though 750s also work fine)
- stock 400# bag in center
- 650# IBS
- all filled 100%
- wake plate at 1/2
- 10.5 mph
- ghetto gate on non-surf side (see other threads for all kind of ideas how to build these)

My guess is those surf tabs you mention would be the manual Flow, but the cost on that is probably more like $1400 (and as much as $2500 depending on your needs and dealer). My take would be to go with the DIY gate which is much cheaper and just as effective (if not more so).