interesting that you guys been experiencing lag. The lag wouldn't compare to what i'm driving now hhehe Subaru Liberty GT 2L Turbo (legacy over there) but yeah a few of us fitted sprintboosters, instead I got a reflash of my ECU. Made a huge difference over the sprintboosters. Gained 20kw at wheels. Wonder what ecu/engine management solutions will be available for the 135i.
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