You are lookign at this motor, right?
http://www.rc-monster.com/proddetail...WAND_XL&cat=20
BrianG's calculator is right. The 9xl motor is in the 1800KV range, and the 8xl is in the 2000KV range. The data in the RCM store is just wrong and it has been like that for the as far as I can remember. Don't pay attention to the ratings. Just buy the right XL number.