After I rode my 08 XP for a while I thought I missed my XRS but after riding another rev chassis side beside my XP there is no comparison, the XP will out perform the XRS easily. The XP chassis is MUCH different to ride, too much rider weight up front compared to the rev, need to slide back while trr riding in order to handle good. Climbing is where the XP shines, the less weight is very noticable and can easily climb the older rev chassis. Last year a STOCK 163 XP was out climbing a Turbo 700 Dragon, the Dragon was a 155 and had too much power for the track but none the less it was out climbed buy a stock XP.
-Seeder