A lot of CATs come with heat shielding already on them as part of the assembly. Have a look online and see what is around. And this is part of the reason why I recommended the CAT be put further back from the cabin as they get damned hot, You could probably get away with not having heat shielding with that much ground clearance and space between the CAT and the bed floor (but it's better to play it safe and get an assembly with shielding as a first preference)