Hello! Service Information reccomends that you remove the exhaust crossover, to access the two 13mm bolts holding the thermostat housing in place. The exhaust crossover is below the throttlebody, above the transmission.
However, in this business, time is money, and I have found that with alot of patience, I can use a 13mm wrench and my skinny arms to work around the exhaust crossover (make sure its not hot!) and maneuver it out, without exhaust removal (its very tricky!)
Please let me know if you need additional assistance!