So I remember reading that some people have been getting a good amount of rust on there dp. I live in Wyoming and 3 miles away from the Utah boarder.which means snow in both states and salt in Utah. Are people spray ing it with a high temp paint or what's the secrete?I know the dp has a lifetime warranty but just wondering. Hire does it sound with stock system? Will it be loud on the intrastate going 65 to 75?