Here is the comparison of my sails compared to the stock sails. The main has a bigger head. The jib works well so far, it does take some attention to keep it out of the spreaders when the mast is rotated hard. As far as tacking is concerned, there is no noticeable difference in how well it works.


Stock i20: Upwind: Main 194 sq. ft., Jib 49 sq. ft. Mast 15 sq. ft. = 258 sq. ft.
Open 20: Upwind: Main 214 sq. ft. Jib 53 sq. ft. Mast 15 sq. ft. = 282 sq. ft. or 24 sq. ft. more sail area upwind
Stock i20 : Downwind: Main 194, Jib 49, Mast 15, Asymmetric 278 = 50 sq. m
Open 20: Downwind: Main 214, Jib 53, Mast 15, Asymmetric 256 = 50 sq. m