I am considering running 4" stacks out of the Bed. I like the look and It will keep the exhaust tighter to the bed and the tips will never be submersed.
Also never seen A M715 with them.
The only ones I have found are Chrome (which I will not use), Polished stainless (which I would sand blast to dull, and Aluminized which I could leave natural or paint black with High temp paint.
I like the brainstorming, let me hear your thoughts.