105 mph on the back straight at Shenandoah Circuit. I have OFT stage 1 and Perrin CBE.
It was funny because a guy with a stage 2 GTI was smoking his brakes that day, and he was telling me it's because he was making a lot of power and "hitting 105 mph" on the back straight before the hard brake zone.
At first I was trying not to say anything, but eventually I let it slip out that my underpowered Scion was around there as well.
He should have had about +70 whp on me so I was a bit surprised, but I'm guessing it's because we were exiting the preceding corner at different speeds.