The M5 previously proved to be even more powerful than BMW claims, so would the M550i follow suit? Well, RaceChip’s results show that the 2020 M550i produces 526 horsepower and 568 lb-ft of torque. BMW’s official numbers are 523 hp and 553 lb-ft. That’s pretty close but, like the M5, it seems that these BMW engines are producing more torque than claimed.
Next, the guys treated the M550i to a tune, and the results were certainly impressive. The M550i was now pushing out 585 hp and 645 lb-ft. Compare those figures with the M5’s 600 hp and 553 lb-ft of torque, and it’s clear that a tuned M550i can give unsuspecting M5 drivers a real scare.