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I was just going to use exhaust cut outs. They are very common OE on older 1980s vehicles. Most are vacuum or mechanically controlled.
You don't want all the engines exhaust trying to go through the cooler while running at speed. Plus you will want a way to close off flow to the exhaust heat exchanger when the weather warms back up. All of it at idle while warming up might be nice.
I think after the catalytic converter would be the best place to put it. The exhaust will be hotter and contain less soot.
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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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