Im not surprised about the HP gains I'm surprised about the HUGE Torque gains...
I Dyno'd at a tad over 400 WHP and 295 WTQ and I'm naturally aspirated. Im very close to their numbers on HP but Tq they KILL me. As an FYI that dyno was on a wheel hub Dyno (Dynapack) using instructions from pencilgeek for gear and ratio to use.
2012 E92-M3 Space Grey on Fox Red, DCT
2011 B8 S4 S-Tronic , Black on magma red