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I'm sure at the speeds I'm driving the cats (when they work properly) don't have any detrimental effect. Emission controls are now pretty integral with engine function... I agree, but this truck isn't now, it's 1994. The only emissions stuff the computer cares about is whether the thermactor valves are operating correctly or not... which they are, they just don't connect to anything but capped vacuum lines. yeah I'm sure the parasitic drag of the air pump/pulley is small, but it isn't zero.
TBH I was suspicious of the thermostat thing from the beginning... if it isn't too involved to replace just that I'll do it sometime, they aren't expensive
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