Hey that's my car :P
Here's another graph overlapping 3 400+whp SAE runs.
YMMV but another reason I like EAS is that their dyno procedure is rock solid and consistent. The car is always strapped down the same way, dynoed in the same gear, with the same fans, blowing in the same locations, with the same delay in between runs and so on.
Anyways, the recipe for power is quite simple really; here's what I have:
Macht Schnell Intake
Macht Schnell Pullies
Macht Schnell test pipes
The car also Supersprint mufflers but after comparing dynos with my old E90 (stock muffler) I doesn't look like they are doing anything as far as power goes. I love them dearly though but the MS stuff is where the HP came from