PDad, I have been running the 3.2" pulley with drilled 160 stat for a few months now with no problems. It definitely runs cooler than the drilled 180 even with the standard INTENSE PCM. The trick, as I have told you before is using the EStat from ZZP. It tricks the PCM into thinking you have a normal 180 stat. The fans are always on this way and the engine really runs cooler.
If you don't do it, I will be laughing at you in about 45 days.
Wiring in the E-stat will take you about 5 minutes and can be disconnected in about 2 seconds and reconnected anytime. It runs in parallel with the existing temp sensor that stays in place.
....and yes my fuel economy has improved and plugs running clean.