Technology stays the same for 3-4 years, they just like to make you think it's new and shiny. You can get the t motion upgrade kit for a couple hundred bucks to make your 2010-2013 the same as a 2014, 2015 or whatever. In essence the XM is more or less the XP with a flexing track, t motion kit and narrower stance (a-arm kit). XM will be the same for another year or two before they come out with the new platform. The core of the engine/frame/tunnel don't really change for at least 4+ years. Ptek engine was 07-2011 (and they still make Pteks in sport models) and them Etec 2011 onwards - 2015+ for engines. Even with jumping, 2 years is definitely do-able. With high mileage, I wouldn't keep more than 3. I figure the sleds have about 10,000km of chassis wear on them before it's time to put lassie to pasture. I only put 3,000km on my sled last season and no damage, so I held on to it for another year. If you're learning and crashing I guess you're putting a lot of wear and tear and it might be smart to trade out earlier if you've done a lot of chassis damage, it's the tensile strength in the aluminum that goes, in the tunnel, running boards, drop out brackets, s module, etc. Once that happens you might as well write it off. No amount of bracing will stop 'em from crumpling and a tunnel is like $1800 for the part at 12 hrs of labor if you know what you're doing.
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