the ebay one is really crap if im honest the pipes dont even fit and they are really horrible quality, plus it wont fit behind the standard mk4 front bumper so you will have alter you bumper to fit or buy another that will work, I personally wouldnt bother with a fmic, just get a good remap done and a long ram cold air intake, a good cat back exhaust with decat, you will feel a huge amount of increase in power.
a fmic will only make a major difference if you upgrade the turbo that is just my opinion.