Bought a 15 Pro 163 not running too hot but does heat up some in the harder snow here in the midwest. I have read a ton here on Snowest about cooling etc. but have not seen much about the so called ported snowflap. So.... how about a MUCH longer snowflap on these would that help? Seems to me we are loosing most of our cooling snow out the back.
PDP helped on my 11, you need to run it longer, and with a strap on it, you can reel it up for the deep, and backing up. Still can be a PITA for anyone yanking on the rear bumper. Cut the corners off if you get one that's square. Better options are adding a cooler or TRS/SD themo. If you can't mod your cooling system due to a PITA dealer and warranty, flap, scratchers, snow on top of tunnel, and technique (spinning enough snow on the coolers before it gets too hot) will be your options. As you may have seen, getting snow spun on them will cool it quickly. You just gotta watch and live with it. FWIW, you're not alone anymore - T3's in particular aren't far behind with the issue.