I bought this boosted 08 Si after selling my 09 Si a few weeks back. I am learning quickly everything I can but I found that I do not like the location of my blow off valve. The vacuum line is Teed into a stock hose going into the manifold. Can anyone tell me what that hose is coming from and if I am okay to delete the T and run the BOV hose straight into manifold
That is your PCV valve. The line running to your BOV is using this splice as a reference to manifold pressure to know when to open the valve(probably). The way it's setup is fine as long as pressure holds. If you want to relocate, find/create a different vacuum line for manifold pressure and tap that instead.