I have a GTI MKIV 2001 1.8T I been taking a deep consideration of getting an aftermarket DV or a BOV due to that fact that ever sense i had this car from day one, i have noticed like a fluttering noise. My friend calls it a horses noise. Now i have checked everything for leaks and there is nothing. I know i am not the only one that gets this because i seen the same thing in other forums but no one tends to give like a remedy for this. This only happens at low boost only in first gear and sometimes in second gear but other than that its fine but how may i stop it from happening or is it just might be better to get an aftermarket DV or BOV?