The bSt.C option is a beta feature that reads pre-throttle charge pipe pressure from vag data... it will get slightly higher peaks and won't show manifold vacuum because it is reading the sensor in the charge pipe. Some people prefer this because it lines up exactly with a vag-com log compared to regular p3 digital boost which lines up with what an actual gauge on the manifold would show(boost and vacuum).
TFSI option is good for both tsi and fsi cars, including Golf R.
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