I have recently installed the BT Moto tune into my 2021 R3 GT. The difference is very real especially at the high end of the now increased rev range.
35 HP increase and rev limit> to 7500 rpm. Easy w/o any mechanical changes needed. Highly recommend this.
The company (in Mass.) sends you a small module into which you load your ECU program, send it back to BT. They change the tune to their program and send it back to you. Voila!