Went out for some testing prior to One Lap of America 2021, and decided to throw the A7's on for a lap to see how much time the car has picked up since last October when I was here (without the supercharger.) Almost 3 seconds, with a couple big mistakes in this lap that kept me from clicking off that elusive 1:49.x - next time. Windy and 80 degrees when I ran this lap - some prime conditions will definitely help. 

2011 BMW M3
3525 lbs w/ driver
ESS G1 Supercharger
BW X-Pipe / Akrapovic Catback
Titan7 TD6 18x10.5 Forged Wheels
295/30-18 Hoosier A7s
MCS 2-way remotes
AP Racing RadiCAL BBK F/R
Core4 M14 Hubs