Regarding the BPV, I am just not sure why you would replace it when your stock one is more than fine. If you are going to be recirc there will be no difference. The only difference will be that you have a nice shiney BPV to look at when you open your hood. If that is what you want then it is your money and you are free to spend it how you will. We are only offering advice as that is what we believe you are looking for.