The BOP OIl Pan Gasket adresses a well known 998 turbo issue. The rollover valve freezes and creates pressure in the oil tank that causes the oem gasket to fail. The BOP gasket creates a stronger seal than the oem silicone seal. Torque the oil tank screws to 6lbs/ft instead of the reccomended 12lbs/ft and use blue loctite on the threads. Gasket is a direct fit on Vipers and 7000 snowmobiles. On the 998 snowmobiles theres a small trim to be made, see attached video:

https://youtu.be/jN1c6PkeemI