I just returned from a day of riding in which my 2002 800 efi mtn cat would bog when the exhaust exit was in 3 to 4 feet of powder. A couple of times each year when we get to ride in over the hood powder my sled would act like it was jetted full rich. I mounted an exhaust deflector but with no better results. Is the efi senseing an exhaust restriction and changeing the jetting? My sister has the same sled with the same problem as does my brother-in-law with his new 900 efi mtn cat. We need help... None cat sled ran fine.