Join Date: Sep 2006
Car: 2004 Facelift 75 Connoisseur 1.8 turbo with DD Pack. And remember, the troof is out there.
The heatshield is exactly that. It shields the floor against heat radiated from the blistering hot catalyst and exhaust system. The temperature of the cab will be affected very slightly I suppose. I guess the underseal coating may suffer heat effects over the long term, but most cars manage without this refinement. It's primarily a refinement, like many aspects of these fine machines.