How much louder with downpipe

I was looking at the youtube video, the akrapovic evo exhaust sound reasonable, not too loud. How much louder if add catless downpipe with the evo exhaust? Much much louder or just a bit louder?



It is a bit difficult to tell the level of noise from the video with and with downpipes. Anybody has experience with the sound before and after downpipe with akrapovic exhaust?