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I have no idea what the exhaust tip temperature is. That is a good question though. However, there are so many variables that its impossible to just say it drops 300C and get a wattage number out of it. It all depends on engine load, rpm, airflow over the pipe etc.
I'll hopefully get to making a bracket for the EGT sensor soon. I'll video my gauges on my daily commute one or two times to compare warm up times of the coolant and exhaust manifold. From there, we can see if using the manifold (and probably exhaust piping) is even worth it, or if we should junk the hot air idea and go the route Toyota did and put the heat exchanger inside the exhaust pipe (which is definitely more effective, but also more complex).
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