Has anyone seen
THIS also?
This guy apparently pulled 400whp out of the smallest EFR, the 6258, at 27psi but dropping off to 18 by redline. Says his previous GT2871 was good for 352whp at 18psi, meaning this smaller turbo outdid it by nearly 50whp.
All this on a stock head/block and 93 octane. I'm amazed if this is accurate and not the work of a lucky dyno.
The 7163 flows 16lbs/min more than the 6258...