Hey i just installed a greddy type S on my car last night... took about 3 hrs and all (BOP is a bitch) however tuning is a breeze with it! It sounds really nice especially at really high PSI blowing off and is plenty loud. There is one thing i noticed last night as i was driving around however. Alot of time when i let off the gas and just start to decelerate in gear (or even sometimes when i put it in neutral and just brake), i get this kind of high pitched whistle that sounds like my brakes are screeching for a couple seconds and then it goes away. I dont think i hvae a boost leak so that isnt what it is. Another guy i know just put one on his car a couple weeks ago and his does it too. Any ideas?????