FWIW, I my speedo hit over 180mph last weekend....I wasn't staring at it but I believe 185 was the max I hit
Not GPS tracked, so I know it's not true ground speed. But it was still really freaking fast.
I was also on a slight decline, which I'm confident it helped.
I didn't hold it for long at 180+, but the car was very planted at the 175mph that I kept for a good couple minutes.
Again, every speed I listed is speedo speed, so you want about 7% correction for true ground speed. Just saying.
I have an AA Xpipe with an OE Tune with the limiter removed.