Not discounting Jim's work or anything but just for the record; raising (shimming) the cylinders (which raises the port timing), shaving the head, and altering the timing curve is an age-old speed shop trick that has been no two-stroke secret for longer than most of you have been alive! The drawback to doing this is that you'll lose some low end torque but the pipes can gain that back by higher sonic reflectance as can advancing the timing at the beginning of the curve. This isn't something Jim discovered, he's simply putting up the numbers by going down that path (and good luck with your warranty if you decide to take that path!).
Have FUN!
G MAN