Some questions about the A320's performance

First of all:

Ta na na na…na… NEO… Ta na na na na na…na… SPORIN. Master Pang, Kung Pow

Okay, so why does it have a 45° bank limitation? And how do I get it to not sound the Overspeed warning after 480+ KTAS? The Overspeed warning comes even earlier when I’m really high.

Bank angle limit because its a tube liner. Overspeed…because you are overspeeding the aircraft.

So I’m out of luck then…