Re: GT6 Hot Box? You weren't kidding!

[Chris Kantarjiev <cak@dimebank.com>]

Insulation is key. I used Reflectix, a 3M product found in home stores
in the US. It's bubble wrap that's been coated with mylar. Put it
under the carpet, everywhere (replace the jute underlayment with this).
Insulate the gearbox cover. Make sure that the gasket between the
gearbox cover and the body is intact.

Also consider getting the exhaust manifold/header coated with
something like Jet-Hot, to keep more of the exhaust heat out
of the engine compartment.