@mrsammy07 False. It has two same sized turbos. Both small. Each powers 3 cylinders. They both spool up at the same time, which is very quickly. No lag, but no top end either. It falls flat on its face after about 5500 rpms.
@ChickenGriller77 Haha, I thought the same at first. The truth is, they are both the same size. Each turbo powers 3 of the 6 cylinders. Two small same sized turbos to give gobs of torque in the low and mid-range of the revs in this specific vehicle. The 135i actually falls flat on its face in...
MotorTrend has the 135i tested at 4.7 for 0-60mph. No soccer moms were hurt in the making of those reviews.