The XRS i buggy is a cheaper version of the X10, it uses plastic parts instead of graphite, fibreglass instead of carbon fibre and there's some other differences which im not too sure about...
The X11 replaced the X10 and has many improvements over it, A new chassis with swept up sides, Front aluminium X brace, Aluminium pivot blocks and loads more...
Best thing to do is give Lewis/Yanina a call at extreme, they will be able to point you in the right direction..
Hope this helps,
Tom
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