Quote:
Originally Posted by christofoo
The exhaust gas gets up to around 500-600 C, but exterior to the pipe nowhere near that hot. I put a K-type thermistor inside the cat shell, for my curiosity, on my Corolla which has the cat located under the floor. My highest reading was 260 C, IIRC. Inside the engine bay with grille blocks it could be hotter, but I'd bet against anything much over 350 C, even touching the exhaust manifold.
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And it's still possible to wrap some thermal insulator to reduce the heat radiation around the pipe, or to get it ceramic-coated.