My 2¢... my opinion.
Beyond the engine... make sure that entire sled is running correctly.... The turbo voids the warranty on the sled all together.
A few rides to get all the parts working well and broken in (chassis, electrical and engine) before adding more power.... sounds like a good move to me.
Good luck with your new sled...and PRAY FOR SNOW!!
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I get this question a lot when I'm on customer service duties for Silber. I agree with what MH says.
These days, it seems if you have a lemon sled, or something is going to go wrong, you'll notice it in the first 100-200 miles. I also feel breaking a sled in stock form is best for a few reasons.
That said, plenty of dudes throw a turbo on from 0 miles (I've done this too) without any problems. Just keep boost low to start, make SURE you aren't over revving and rock.