as above really... i won a k and n 57i induction kit from performance vw many years back for writting a letter about this website when it was very small... lol... anyways.. fitted it and after no noticeable gains other than the noise, it fooked up my maf along with my my engine blowing up.. so in a word unless you get a dry one dont bother,... after getting my engine rebuilt i drilled the lower half of the airbox which gave same induction raw, and probs fook all gain performance wise but it sounded good and i knew it wouldnt fook my new maf....