had a g25 since about 2005ish, 0 problems except 1 broken clamp (i use a rubber oil filter removal tool to tighten them ) so its now tied to desk on one side, bit looser than my bros 2008 model but that kinda helps.
edit: its been thown about all over the shop 90% drifting.
actually its the spring releasing charged air forward of your compressor and the flutter is caused by the spring bounce. can change your spring to get a better sound, too hard though and it wont release enough and cause backpressure making your turbo turbines stop suddenly and damaging them, thats the whole point of a "BOV", dump valve.