I am running a TIAL Q BOV on my stage 3 stock turbo. It is the best option by far. I had the Boomba for a while. I had the turbosmart, and did not like it. I switched back to Boomba, it was great do not get me wrong. It is cheap and awesome. But like I said I switched to the TIAL Q BOV, and let me tell you what a difference. it holds boost better than stock by far, It sounds amazing, and has added a nice touch to the car. It was expensive, yes. But talk to Russell at DHM about it. I am telling you it, it is MORE than worth it. and if you upgrade the turbo, that is a few hundred you save.