10cm^2
gate will go off the manifold (ETM)
So with a 3.5" exhaust and the 50mm gate, should make an easy going 250rwkws on 98 once the fuel system is sorted
I wouldn't trust the pfc knock reading.
Only true way to get the maximum efficiency for that cell.
Is to load it up on a dyno and hold it at the poad point and play around with timing and fuelling