hi there, ive just fitted a forge splitter dump valve on my A4 18T 2002. but not sure if i have fitted it right as it sounds the same as the stock unit.i have a k&n induction lit fitted and that is were u hear it from it makes a flutter sound.....even tho the forge has a trumpet it still comes from the filter also should the sound be a tooosh not a flutter.....has anybody got 1 fitted..thanx ady