Report Exhaust Wrap in Engine Posted August 23, 2023 I’ll add to this post by describing the heat management I have done on my S3a. I double wrapped the exhaust manifold which made a big difference, you can wiggle the manifold out with the engine in place if you disconnect the steering at the bulkhead and remove a couple of manifold studs. I put insulating silvered bubble wrap on the engine bay bulkhead and down the tunnel, you can use other heat reflecting material but I had a role of bubble stuff. I used proper heat mat on the inside of the drivers side footwell before I glued camping mat to the tunnel and door sides then covered with carpet, floor was left bare and carpet held down by carpet studs. bonnet was wedged up 5mm to let hot air escape ( this had an extra cooling effect. some cars have a cold air scoop fitted to the rear of the alternator as cooling air is drawn through from the rear so I added a cold air feed from the nose one to the alternator. I made up aluminium heat shields with heat mat to protect the alternator and the master cylinder/servo/ignition leads. heat is transmitted by conduction (touching or connected to a heat source), convection (heating the air around something) and radiation (like heat from an infrared lamp).