I ran 630's with the S4 maf with 3bar map sensor on what I called revo stage 4. Ran spot on. Its not a production code, but could be made into one. I did have the SEM and 80mm TB, but that should not affect you too much.
I'll probably run the 550's @ 4bar with that MAF on stage 3 Alex, which works out at 616cc's, so not far off tbh. What you think?
Did you do any tweaking with Lemmiwinks?