I have the same BOV on my MSP. You might be using too stiff of a spring. Did your kit come with three different size springs? If so, try using a small spring. My BOV came with three different springs, a small, medium, and a large one. If you have three springs, use the middle sized one and you should be ok. I use the middle sized spring and I still get turkey on light or moderate throttle. In full boost, I get a loud chirp then a whoooosh right after it. The small spring won't allow the valve to close all the way, the medium spring is the best option because the larger spring will not allow the valve to open and you will get a lot of turkey and possibly a lot of backfiring between shifts.