So we have not heard a lot about the performance between the 154's and the 163's. Lets hear it ! Was the 163 outclimbing the 154 ? We don't ride with two many 163's except for one and it did no better than the 154's, it was too busy blowing belts. Other experiences ? I guess we have been to busy re-engineering the platform to be bothered with the XP vs XP. ????