Hi, I just saw a golf 3, this one probably had a blow off valve built in, because he had this hissic noise when switching as you know it from 2 almost 2 furoius. In addition, there was a popping out of the exhaust when rolling (eventuel misignition) just sounded great, would like to know if it is possible to install a blow off into a lupo, because I found only blow off for turbo ́s on the Internet and not for vacuum cleaners. Also I would like to know how to put this constant bang into a lupo. noise while rolling can be achieved. MFG