hey how about you experiment and troubleshoot your problem.

are you pressing the L button next to the turbo sound volume or muffler?

dont.

press the L butt next to the dump valve muffler or sound (whichever field has the "L" next to it).

i tried these bov's and all of the compressor surges sound cheap and fake...and all of the bov's too. just my honest opinion. i went back to the stock sound because it doesnt make me giggle at what sounds like a person imitating what the sound of compressor surge sounds like.