I almost ordered JUN AVCS intake cams for a customer's engine which runs EJ20X/Y cams on a USDM MY05 Legacy GT ECU.
I'm now discussing with JUN if they can supply the cams with the other AVCS pick-up pattern. If they can't, I will use standard Subaru intake cams off a MY07 Legacy 2.0R. Those are atmo cams with AVCS, 248 degree (standard turbo AVCS cam is around 240) and 9.8 mm lift. The atmo engine makes 168 ps @ 6800 rpm.
I think the difference (slots or ribs) has to do with solid cams (cast ribs) or the latest hollow cams (slots machined into them).