Went out for a paltry 325 mile spin along the Mississippi River.. they built a new bridge at Savanna/Sebula, and since I've already crossed near all the bridges over the Mississippi i was like "oh! this opportunity comes across once every 10 years or so.. gotta action it." Did so and completed some unfinished parts of the Lincoln Highway National Scenic Byway on the way back.
Brought with a temp gun; am pleased to report to the forum that after wrapping my Y-pipe, readings of the floor pan/trans hump never exceeded 89*F during a 7 hour somewhat-spirited drive with ambient temps ranging from 70*F to 50*F. Sadly, I don't have temp readings from before I wrapped the pipe; that being said, the passenger compartment was noticeably cooler. A box of wrap costs $15 on Amazon. This mod is very high on the cost/benefit curve, and I recommend you do it.