Very noticable, midrange pull is huge. I know the figures themselves aren't 100% accurate, but as a comparison using the torque app, same stretch of road.
Stock it was recording 0-60 in 4.0 secs , 0-100 in 13.3, quarter mile in 13.8.
After 0-60 in 3.7 secs, 0-100 in 9.5, and quarter mile in 11.8.