If you are looking at SC your car , you should look at building a Air to Air setup vs the Stillen kit
If you do a search on this site about STillen SC you will see better kits can be made and get way better results
As for BOV yes you can get one , I used a Turbosmart
Not mine but it did sound similar
https://www.youtube.com/watch?v=Qs-JcabcVAE