When people mentioned how smooth the EJ207 is, they're not exaggerating. I've been driving the car with a stock EJ205 downpipe (which contributes to the "roughness") and no AVCS. The car idles smoother than the EJ205, but now that the AVCS is wired up, I have no codes (YAY!!!!), the throttle response off line and the transition from off boost to boost is much much more linear. The car feels like it just wants to take off, a eager beaver if you will. It's actually a bit "touchy" with even the slightest throttle input. I am still adjusting to it, but I would rather have this than the lag-blast off feeling without the AVCS wired up.
I am still using the stock downpipe as the JDM downpipe was too short to mate up too the CBE, but once I bolt on the Invidia downpipe and have the car tuned (shortly), I imagine the car will be even more smooth.
I will let you know what the Dyno numbers after the car is tuned.