Didn't left the project yet. Paired with M GT, SS race and MPE.
Meistershaft GT is loud and have some exotic Lamborghini like sound within 3-5k rpm at light accelerating but heavy raspy in flooring. There was thumbs up from people.
Supersprint Race is smoother and lil'bit less raspy but don't have exotic sound.
M Performance is louder than i expected but quieter than previous. Sound is better than SS but not like M GT.
Videos don't reflect the sound i hear in person (lack of splitter, cables and mics). Raspy but not too bad.
I'll delete first H soon but it seems if you delete primary cats you have already raspier setup. After that replace secondary cats with long resonators.
Stock pipe H-pipe is safety but you don't benefit from stg 2 tune.
So i'll keep going to find breathier and acceptable sound.