[ozinaldo]

Those are obviously at the wheel numbers and seem pretty high for a mostly stock car with just 2/3 of the exhaust is modded. I know that dynojet numbers read much higher than Mustang dynos. My recent dyno run on a Mustang dyno (car 100 % stock) just before the install of Evolve Race exhaust with N55 mids ended up with almost identical numbers with what GIAC reported in the past for their stock 1M: max. 294.2 hp and 342.9 lb.-ft of torque which (if I follow what my dyno operator and others suggest) should interpret like a minimum 353 hp (or 358 ps) and 411.5 lb.ft (or 558 nm) crank. I was told to multiply the atw numbers by 1.2 to reach calculated crank numbers for a well calibrated Mustang dyno. And since I matched exactly the same of GIAC test I kind of feel safe about the dyno that I used.

Either way, there is no denying that BMW claims of 340 ps and 450 (+50) nm are somehow underrated, especially the torque figure. 1M is closer to 360 ps and 560 nm and sweet spot is anywhere between 2500 to 5000 rpm. Another note I observe, the hp does not fall very sharply like other stock N54 versions and stick pretty well till almost 6500 which is where you should consider changing the gear already anyway. I like the way that M engineers designed stock map.

By the way, what was the fuel you were using at the time of dyno?