Hi People My Friend Has A 03 Xt600e And Is Wanting To Do Some Mods To The Engine, He's Got A K&n But Thats About It Is There Anything That He Can Do? Maybe A Diff Carb Or Would Jets Be Good Or Diff Barrel? There Seems To Be More That You Can Do To The 660 Than The 600 Or Am I Just Not Looking In The Right Places!! Any Help Would Be Great Cheers Dave.