That makes sense, so is it more raspy like that of a c63?in that case don't worry, it's added more base. If I were to give an example I'd say it brings out more of the cross plane crank noise than what you relate to a flat plane howl. Mine has gone a bit more like an old C63 I had. I think you will like it if you want bass.
I enjoyed a very specific higher pitch howl when under load between 2-3k revs which is still there but a deeper tone.
Sorry if that doesn't make any sense, it's hard to describe lol