Here is a great chart for Atmospheric pressure at elevation... looking at Phantom Ap of 14.5 ... chart shows 14.43 rounded to 14.47 to be closer... about to rain in my area is 14.77-80 remember I'm at sea level within 50ft.... so yea it was humid for him...
JerryBMW... AP of 14.29 with chart of 14.16 rounded off to 14.2 to be closer... not as bad humidity but let's call it same...
for every 1000ft if all conditions same is +.010secs... so JerryBmw @11.98 -.05 (michigan elevation) =11.93-.1 for E70 tune = 11.83+/- (basically same as Phantom).... so 11.74 on a E47 tune is possible on a DA 3000 day figuring the E47 subtracts 0.10secs which is very possible.... perfect day 11.64+/- in Michigan = 11.59 @ Sea Level.... Yes... WE CAN BE A LEGIT MID 11's CAR ON STOCK TURBO....
... throw in some XHP and stiff coilovers.. most definitely!!!
I'm just using the common denominators in the info to come up with this.. I have no Idea if I'm right.... but sounds real good... lol....