I dont understand why this thread is still active... if you are adamant about it not being closed, or not making a dif... dont do it! It takes literally like 1min and MAYBE 1$ in parts? I mean if you dont want it, dont. try it! I wouldnt say its noticeable with a camera etc...
just do it or dont... but the commentary about when the valve is open or closed etc is pointless. It is absolutely diff disconnected, just not a HUGE diff.