Originally Posted by Edward
The only definitive info we've got is that one guy's dyno chart and if someone runs 1/4s to get trap speed and time.
There are comparison dynos on this forum, made by BMS. The N55 has a bit more hp on top, but a bit less low-end torque.
The problem with the N55 is that it has more lag than the N54 (according to BMS butt dynos and real dynos - you can look it up on BMS forums).