If you really want to do something with all the heat going out the exhaust on a typical vehicle get a diesel and put a turbocharger or 2 on it.
Before I turboed I saw EGTs in the 1000'F to 1100'F all the time, now they rarely go above 800'F and normally stay between 400'F and 600'F.
These are all preturbine temperatures too.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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