Here is an email I got from them after inquiring about the uprated stator, or rewinding a stock one to get more watts. Copied and pasted:
Our rec/reg (part# 10-013H) will give you an additional 40 watts of electrical power. If that's enough, it would be a super easy upgrade for you! We have them in stock & retail price is $150 + free ground shipping. Just click on the link below to see a photo and/or place your order.
Public Relations & Marketing
Rick's Motorsport Electrics, Inc.
30 Owens Ct. #2
Hampstead, NH 03841
So there you have it. They flat out said the R/R gets you another 40 watts.