Tim I get a lot of heat into the interior from in my C5Z. I believe they have a kit to insulate the interior better from the primary source of heat, the exhaust bundle right below the seats. It can get uncomfortably hot on occasion.

I hope that your issue is just exhaust and not something else. Any idea what kind of running gear temperatures you are seeing? Maybe that is not even possible to get I am not sure.

Good luck.
 
Tim.. What's getting warm.. Your feet or your butt!
The exhaust is probably your heat source.
The tranny is behind you, but the exhaust can make it warm in the footwell.

I never have the top up so I get pretty good air circulation in the car!
And both the tunnel area and rear area have been done with a DynaMat type product under the carpet.
I've never noticed a heat issue.

Keep your cool.
Graham
 

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