I pulled my skid on my 03 rx1 with 11k miles and notice my "y" in my two y-pipess had gotten so hot they melted and collapsed. We run under tunnel exhaust, and I just adjusted my valves. My sled has been running real strong. I also recently installed an electric fuel pump. We run ten other sleds with the same exhaust setup, and I have never seen this. The pipes are totally exposed to snow, and I travel about a half mile on road to reach our snow park........but we always have for the last 8 years with our tons.