Evening all im new just got myself a s3 1999. Sorry if this question has been asked before but im after a dump valve for my s3 but a lot of people have been telling me thats its not a very good idea to put one on my s3 as it will damage something??? Is this true im not after a serious noise just soemthing nice a suttle will do. My friend runs the same engine as me in his golf and he told me that you will get a better noise by putting a air filter on ????