BMW M135I
How many people have had this done, either by RSTuning, GDI or Ktec (depending on what offers what obviously) and what kind of figures for mpg you getting as im deciding between them both?
While discussing this, what would be quicker in say 0-60, 0-100, 40-100 and quarter mile etc between the two if running the same bhp figures?
While discussing this, what would be quicker in say 0-60, 0-100, 40-100 and quarter mile etc between the two if running the same bhp figures?