While I agree stock Winder is best for reliability.....I think most of us who are tuned know there is a HUGE difference between stock 204hp and 270++ hp. For me the HP total is less of a concern, where as the EARLY SPOOL is what makes or breaks these sleds corner to corner.
If I only rode lakes, or big wide open trails....I would be fine with a stocker.....A stocker comes on very docile and does not hit hard at all, it ramps up slowly then pulls nice and hard up in the RPMs.
But for corner to corner, I will say the Winder is a DOG. It is not fun, nor flickable and feels like a pig. When you blip throttle quickly the sled simply goes nowhere. So lifting the nose off knolls/moguls or snapping the sled instantly corner to corner is IMPOSSIBLE. Honestly I hated my Winder stock for my trail system. The 998 becomes a total different animal when you add a early spool tune, even a 240r hurricane tune early spool changes this sled entirely, and the 270r tune even more so.
So I recommend everyone ride their Winder for 500 miles until your first oil change. And if you run big wide open trails you will easily be happy with stock HP and how the stock ramps up the BOOST slowly from 5500 to 8800.
Dan