Matt's GTI and My GTI are both tuned for mafless and run Turbosmarts EBC's, but Matt's FSI Jetta, I have tuned for maffless, but use N75/ECU to control boost. With the GTI's we run 28-35psi and it is easier to maintain 30+ psi with an EBC vs ecu/N75, but with charge pressure around 28 psi and under I will use the n75/ecu to control pressure. With some time spent working on several tables like load, cylinder filling and etc... I have gotten the Maffless setup on our cars to operate very well under both normal driving and racing conditions.