Sputter in soft snow

[sledbasher M7]

Got an 06 M7 LE.runs great when skiz are off the snow,but when pushing soft snow sputters when you wack it WOT.If let sit for a bit rips until the soft snow gets over the hood.I have looked for snow injestion,i sealed the front belly.i can't find anywhere the snow is getting in.Checked the baro tube.Its an on/off thing.If I follow someone track then crack it and off in the soft good until snow comes over hood.Intake vent by windshield are not plugged?
Kinda erratic explination but thats what it does.Any help would be appreciated.

 

[PowerJoe]

I know you said the intakes by the windshield are not plugged but even if the snow covers them by 50-75% you will bog. I had to make deflectors for the intakes to keep my sled from bogging in deep powder. Could be your exhaust plugging but I have only heard of this and not experienced it.