Some thoughts:
1) there is a thread on tdiclub now about using a vaccumme thermos to hold heat (I know not same, but worth a look).
2) how about a big EGR cooler off say a semi? Should be reasonably priced.
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2016 Tesla Model X
2022 Sprinter
Gone 2012 Tesla Model S P85
Gone 2013 Nissan LEAF SV
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
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