Ok, here’s my first attempt at the heat shield. I made it so it stops any radiant heat from the header where there is no oem heat shield. It also goes over the oem heat shield that covers the down pipe so it’s double layered now with heat shield. I also made it an “air duct” style so it works in conjunction with the 4” bilge fan. Now the fan blows the header heat down and out versus just all over. In theory this should work great but I’ll try it out soon and see how hot the floor gets.
This is the first piece that channels the bilge fan air down.
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Now shown with the second piece to shield radiant heat and continue the duct.
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Here’s another view
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It fits under the floor nicely and doesn’t make a rattle sound yet. I used aluminum sheeting and rivets. Maybe it will last?