There is a 3" clearance between the trunk and the pipes and the side that you can't see gets lined with heat reflective kevlar.
I doubt that your average production vehicle today has that much room between the cats and the floorboards? About an inch is what I sampled.
The quick release Dsus fasteners the factory uses to hold the tub in place serve two purposes. One is to keep it place for safety reasons, including a roll over and two, the fiberglass needs to be pinned into place OR ELSE the heat warps it.
Don't believe me, run around with your trunk tub not button up into place for a few weeks then come back and try to get the Dzus fasteners to connect.
The tubs tend to warp and you will find that the correct left to right dimension is 54".
After it warps, the dimension will be 52-1/2". The Dsus fasteners will now miss their mounting by 3/4 to 1".
What this all means is there is heat natural to the rear trunk lining anyway.
If you are ever in the market for a used tub, make sure you check that it measures 54" wide. Apparently a lot of cars never had the Dzus reinstalled after engine work and they are warped pretty badly.
I definitely will test the temperature but I would still keep ordering my brick oven pizza from Carlo's.
For a time shortened/modified tubs were offered by Hall. Cheap too. $250. Considering the time to do this, that was a bargain?
The insulation looks like this. It ain't cheap stuff. Spin-off from NASA.
