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they will be fine for park but all mtn is gonna suffer. still your small enough and its a pretty good deal i would do it unless you hate shorter skis
i would find another shop to get them, you need 176's at the least, especially if not skiing 100% park.
That being said they are a great ski and if money is that big of an issue 171's will do the job, but i would mount atleat 2-3cm back.