Invasion Part...3, i think... It showed that while Kara was controlled that she was only roughly equal to Flash. 

She surely didnt hold back in her chase which means that she went all out and Flash wasnt captured. 

But from previous times (the supergirl x flash crossover) we knew that supergirl was able to keep up with Barry while the latter used the device to make himself 3 to 4 times faster, according to the Arrowverse wiki Kara was therefore around Mach 13.

Wouldnt that mean that the Flash from Invasion Part 3 (or 4) was Mach 13 on his own? 