I know there is an air box mod for my 05 but I want to know who has done it and what kind of power or performance increase they got. I know a lot of you are like me, when I did my mods I did them all at once so I can't tell you what worked the best. I just did an air box mod on the wifes 250X and it was like night and day. the bike gained an easy 3-5HP and was amazing. does the WR mod sound similar to that?