Didn't have anything to monitor it but the stock gage that started on its fast climb to limp mode. I let off and downshifted before I got there. Monitored just driving around town with AC blasting in slow traffic with my handheld scanner in 85° temps and it was hovering around 210. I believe I have a 195 stat in there right now.How hot was your coolant getting with the stock t-stat. Mine would routinely be at 215-220 which isnt a huge deal. its when I start seeing 240's that I get nervous.