Your Combo sounds really very good.
I've ordered the Akra Slip on system together with the N55 Midpipe. Now I am not sure, if I should modify the N55 midpipe or leave it stock. I suspect that it will be to loud also with closed valve.
So far I've only heard the Evolution System.
Can you tell me if your combo is as loud as the Evolution System or louder?
Maybe you have other videos?
Thank you in advance