Of course there's a ways from the heat exchangers in the engine in the rear of the car all the way to the vents in the front which allows for some heat loss. But still, this is with exhaust manifolds that have fins both inside and out. It's not bad for heating the inside up to nearly 90F on a 30F day. But when guys get aftermarket heat exchangers is when they notice a huge difference, because then they don't get enough heat to make any difference in cabin temps. That's because aftermarket heat exchangers don't have fins. In other words I don't think this thread's idea would work, at least not without a finned exhaust manifold.
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