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I would run 144 and just leave it that way. I ride Montana mnts and have a few guys riding pro x, they do ok, the biggest problem you will have is elevation and jetting. Every one I have ever ridden with has a terrible time with it. I would say if you are going to ride often in the mnts, instead of putting out the $ for track rail exts tunnel ext, just pick up a used mtn sled. I got my 99 summit x 670 for $1500. Heck, two sleds are always better than one.
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