Did my first dyno run today at Dallas Mustang, who have tuned many GT's in the area. After the first pull showed 561hp, they looked at the timing and air/fuel and decided it had been dyno-tuned by the previous owner, probably when he installed the transaxle cooler. After 4 more runs, they reached a peak hp of 573.5 and torque of 521.87 lbs. This was achieved at a safer amount of advance than the previous tuner had used. My expectations were for 490-525hp stock moving up to 530-550hp at best, so I am very pleased with the results. He asked if I wanted to do a pull at stock settings, but I was pushed for time and needed to go. Even at a 15% factor, it's making 660hp at the engine, and that is amazing for a stock engine! Here is a scan of the dyno run.
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