Do you guys see any harm in adding a small as in 5-7" piece of pipe to the elbow output on the muffler of a 2014 550?

I’m looking at this because the rear cargo rack I used for to carry my bow in it’s case this year was getting heat from the exhaust output and actually melted the plastic on one of the longer rides to the hunting grounds. I’ll ether need to extend the pipe, raise the cargo rack or put some sort of a heat shield in there as I plan on hauling decoys with this rack during waterfowl.

Thanks
Brett