The original Hacker mod with the A50 puts out the same rpms as the OS 91 - so the thrust is about the same. The hacker electric turbines are putting out more. I have 1 of each, but run them on 10S, I've heard 12S and the turbine is insane.

The A50 is 550 KV and the et is 640 KV

The Scorpion motor is also pretty fast as the KV are the same (630 KV). Easier to mount, but bearings need more maint (lube now and then) and runs higher amps.

How much does your Mig weigh RTF?