Everybody has an opinion, but Honestly if you've maintained your machine it should be fine and how greedy you get, depending on your elevation, pump gas and 5 psi may bring it back closer in line to that of stock HP at sea level!, or maybe 10-20Hp extra which isn't a ton either... so I wouldn't worry! however, at 3500 miles I'd recommend for the heck of it to do your crank, get that out of the way because by probably ~4500- 5k miles, its getting up there for a crank from a mountain sled and I wouldn't trust it anymore. Extra power will strain components more yes, You'd want a rear skid coupler for sure. others mentioned worn out clutches, well you know what? If that was so true you're really going to feel it on a stock sled! but when you have a turbo you have extra power it can overcome some "worn" clutch issues and you'd never even know. I had a turbo yamaha apex, sure a heavy boat... But she was a 310 hp kit, pushed 20# of boost through it on 94 pump with a head shim. had about 9k km on the chassis, I know others with over 18k km on theirs, nytros with a 270hp kit and they still go just fine, just depends if you maintain or not!
So don't let your sled mileage scare you away. You may be due for new jack shaft bearings, drive shaft bearings? chain case? belt drive? as it is with out a turbo, don't matter does it. all fairly minor really and that makes no difference whether you were turbo or not as it's all maintenance!
Also in my experience, don't play the add a pipe game or do this or that or heads, They all make very minimal differences, the real true shot way to add power and maintain it is with a turbo or supercharger. I've played the big bore game or pipes, I was very disappointed, the money spent I should of gotten a turbo because its a true way to add power, everybody plays the numbers game with their pipes and big bores, I call bs unfortunately.
