Yeah, owners of 135, 335, 535's have been complaining about the new/upgraded software for a while now and in some cases BMW has restored their software back for the ones who complained enough from what I hear. Apparently, there was more lag with the new software and the more perceptive drivers noticed it. I would be upset as well seeing as BMW marketed the new bi-turbos as not featuring traditional turbo lag.

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Profeshenal spellar