Alright, I got a TurboXS RFL Bov and installed in the stock position and now every once in a while when I shift between 1-2 and 2-3 i get a backfire. I have my wastegate shimmed up to 10psi and remember that I have the N/A block and head with turbo components. I installed 2 washers in the bov and still it happens. What do I need to fix this? I was thinking S-AFC II but im not sure. Also it has only backfired in one other gear and that was 4-5 shift.