My tuner took all my logs and did as close to real dyno as possible on log dyno. Yea it is correct numbers! Many people rely on this why can't we do this?? Stock turbo I did 477 whp on the same log dyno at e60 and it was 19 to 22 psi.As I said above maybe I missed them, but I have seen ZERO Dyno results. Sure 550 at 21psi would be strong.
Edit: I did see Nick Olsen's failed stage 4 dyno attempt.
DYNAMIC AUTOWERX TURBOS time
22 psi flat boost on e40. (Shitty exhaust)
First run: 490 whp (shitty first run the car was somewhat cold, not cold but just not warmed up that hot)
Second run: 525 whp
Third run: 548 whp.
Professional tuner and he did stated that it is 15 whp +/- here and there. So its about 530 whp on average.