The offside wing gets very hot over the cat, and in fact the underseal goes shiny and wet when the cat is hot. So I played around with some offcuts of aluminium, and some woven heat barrier, and some 'Reflect-a-Cool' and this is what happened:

A simple rectangle, approx 8" x 9" bent over the cat.


With Reflect a Cool on the outside.


Woven mat on the inside:


Securing legs bolted on and insulated:


The cat with a lick of high temp paint where it shows.


It works well, but the wing still gets warm, so I may try spacing the shield a bit further from the cat surface.


DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4