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How do you deal with excess heat when you are up to temp? The exhaust will continue to dump heat into the pipework, thus boiling any non-flowing coolant.
Relief valve into the header tank maybe? Open up your grille block some? Hmm...
Bear in mind that a heat exchanger upstream of the catalytic converter might keep exhaust temps down for longer, thus reducing its effectiveness. So downstream of the cat may be the way to go?
I used to use a hot air intake on my civic and warm up times were a lot quicker than with a normal intake. No messing with coolant or valves etc.
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