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many cars already have coolant passages in the throttle body. a start would to be to remove the tb and see if you can make them slightly larger. you probably cant get inside the piece to really open it up tho. you might want to see if you can route the lines so they pick up the hotter coolant coming out of the engine rather than stuff that has already been cooled from the radiator. another would to tee off those same lines and put your exchanger there.
i would leave the lines alone and just relocate the air ducting to hotter areas personally
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