Well.....the funny thing is i have poeple thinking i am boosting...why you ask... my A/C compressor lets out a loud "pppssshhhhhhttttt" .. when i have the A/C on and let off the gas during hard throttle, or reving at a light,you get a very convincing blow off sound, it was funny at first, but if you practice it you can get that BOV sound perfect at any light or while driving hehe...too much time i know.....but i promise you will get some double takes.....