This is the first time I need to buy one, the car runs much better without it plugged in but the fuel consumption is worse than when it was plugged in, is that normal?The main reason for the post is I'm avoiding cheap ebay fakes, went on GSF and saw they have one for £22! Part No : 187VG0070 and two others at about £130 Part No : 187VG0071 and £126 Part No : 187VG0150Are GSF stocking cheapy fakes? Also I have a K&N panel filter that I'm going to do away with and repace with a Jettex, my reasoning is that the oil covered panel filter ruins the maf sensor, is this correct?