I've read the optimum place is roughly 3" from the Throttle Body.... don't remember where, but on the MSP so many people are putting it on the hot side pipe. I know if I had the choice it would be as near to the throttle body as possible. But if you want to think cheapest way to do it, then make the one hardpipe on the hot side and put in the BOV there. Again, just my opinion.