Not sure I understand your question, but I did that with the RV-9A. In my case, contacted the FSDO, found out what a program letter was, negotiated airspace, etc. Probably lots easier with an ABDAR.
The most significant change was the improved takeoff and climb performance. On the first few full power applications, including go arounds, just ease the power in so you don't get surprised. I found that I had so much climb performance that a Vx or Vy climb was unnecessary and had a too high deck angle.
You'll also find that approaches are steeper with the power all the way back. For the first few, you might just pull the throttle most of the way back, not all the way back.
Enjoy!
Ed