I have been riding for about 3 years and I own 3 sleds.
This was the first sled I got. It is pretty beat, but it is fast. One of the previous owners spent a lot of money on it and rode it a lot in the Adirondacks. It has an aftermarket suspension longer travel trail suspension. The engine was originally 500cc, but it is now 530cc. It has larger Mikuni carbs and was dynoed at 96 horse when the motor was built.
This sled is very comfortable to ride. It was my primary sled until I got the Yamaha. It is 580cc, electric start, fuel injected, and has reverse. It was owned by an older gentleman who lived in the mountains. He used it for transportation and took very good care of it. It is completely stock but I will probably stud the track and modify the clutch.
Hymark Performance Makes a turbo kit for this sled ... maybe a future project.
This sled has an Aerodyne Turbo on it. It makes about 165 horse, has a picked track, a racing clutch, and an extra "Tour Buddy" gas tank.
RS Mechanical Also has snowmobile turbo kits.