I have had zero underhood melting problems in over 400 miles on my mpi 850 turbo. I thought for sure it was a little close to the chaincase rubber plug, but no melting at all.
We've had the deepest days I've ever ridden all year. Never once the slightest exhaust bog. I would try to get it to exhaust bog by doing long side hills through over the hood snow on the the exhaust side and not one time did it even hesitate.
There was one day of the most stupid deep snow I've ever ridden, submarine all day. This day the intake vents would get covered over with snow, get warm, melt and then freeze over. Created a ice sheet covering the intake vents. You had to clean the ice and snow off or you'd get a bog. The 100% stock sleds did it as well, almost seemed worse with the stockers. Got the Z-bros intake vents, but will probably never see snow that deep again, so I don't see it as an on going problem.