You will def. need to take some of the knock out and also see if your advanced multiplier is actually at 16. If I were in your shoes I would take a lot of stuff and when I say a lot I mean A LOT of stuff off trying to find any leak there could possibly be. Take stuff off and put it on tight. Check and see if your o-rings set into the fuel rails well enough. If you have those off just a little bit they will leak and you won't notice it at first cause it does not spray just leaks.