How much for 71 Thermoquad?

You can keep introducing red herrings & other distractions until the end of time.
As I posted back in post #103 which you conveniently ignore because it DESTROYS your argument, folks can read for themselves what YOU posted in post #111, from Chrysler:

Exhaust emissions are reduced WITHOURT SERIOUSLY AFFECTING ENGINE PERFORMANCE.
So even you with your tunnel vision should be able to work out that the Chrys statement means performance IS affected by the changes to the 72 TQ.