Tell me, can anyone have already put this track on the Z4 E85 - gravity performance exhaust bmw z4?

video review - https://www.youtube.com/watch?v=nkxIECff1kI&feature=emb_title
Please advise whether it makes sense to put this track as an alternative to the native one, do I already have equal-length exhaust manifolds (M54B25 motor) installed? Is it much better than the native exhaust system?

video review - https://www.youtube.com/watch?v=nkxIECff1kI&feature=emb_title
Please advise whether it makes sense to put this track as an alternative to the native one, do I already have equal-length exhaust manifolds (M54B25 motor) installed? Is it much better than the native exhaust system?
