Redirecting exhaust downward helps keep a hitch cargo carrier and nearby gear from excess heat. Choose a turndown tip that matches your tailpipe's outside diameter; same-size weld-on styles are common and should be installed by a professional, while clamp-on options slide over the pipe for easier adjustment. If welding, matching sizes gives a cleaner fit than forcing a smaller tip onto a larger pipe.
A smaller weld-on Turndown tip can be made to fit, but matching sizes gives a cleaner connection. You can tack it in place, weld around it, then clean up the welds if needed. Work in a very ventilated area and avoid sparks near the gas tank. If appearance matters, matching sizes is the better route.
Measure the outside diameter of your exhaust pipe and match it to the tip. If the tip and pipe are the same diameter, the tip won't slide over and would need to be welded in place. Check that you have a long enough straight section of pipe for installation, and choose clamp-on or weld-on based on your tools and preference.
Both are options. Weld-on works even when the tip won't slide over the pipe; line it up, tack, then finish weld, and trim the existing pipe if needed to set the look. Clamp-on styles slide over the pipe and make it easier to adjust how far the tip stands out, especially on 4 inch tailpipes. Confirm your pipe's outside diameter first.
Yes, a Turndown tip can re-direct exhaust gasses downward to help protect items on a cargo carrier from excess heat. Also consider a carrier with an angled shank to raise it farther from the exhaust. Before buying, confirm your tailpipe size and that you have room to install the tip.