I'll tell you my experience..for what its worth.
I have a 2k 929rr and I thought I needed it to sound better and have more power, so I did what you are contimplating and got a full exhaust and two Bros. slip on...two days later removed it and it is in my garage, not on my bike.
If you do this you also need a power commander to smooth out your bottom end, it rev's quicker,but on take off it seem to lag without the commander. So you will need to spend another $270 min. so ask yourself; do I want to waste my time messing with my bike for a few horsepower that I wont use anyhow.
I also had problems after removing the valve,kept having a engine light on, only thru a lot of research and headaches had I found the answer,the servo that operates the valve sends its position back to the computer and if it see the wrong position, it errors.
To sum it all up: just enjoy your stock exhaust(I do have a Yosh pipe) and get a power commander first, later if you still need more power,do it. Its such a small gain its not worth screwing with.