[AWF10]

I just got some m5 OEM exhaust installed on my 535i. I wired the exhaust flap open at all times. I'm happy with sound for most part but wanted to see if anyone else was having these issues. For the first 3 gears or so in regular driving mode it is too loud/drone exhaust note in the cabin. If I downshift a gear this helps with the sound while driving at all times. Is this issue due to the exhaust flap open at all times? Also does anyone know what this block metal that's attached to stock rear exhaust hangers? Thanks.