I doubt that will work because it isn't that flexible, only on long curves, like in a trench. Also, how hot does a muffler get? That is only rated to 150*F. Can you smell the bus going down the road after an hour of use? I can. No good in the cold either, will break at -10F likely from vibration when driving.
Maybe reroute your exhaust and muffler away from that area and use ABS pipe.