i can't remember having it tested, but fairly quiet.Just prior to this, had a stainless twin 3 with catch ceramic cats in single 4.
Very noisy.
Approx test level of 105db.
The cat in currently using is a 5" metal cat, don't know brand sorry.
I will try and get a pic of the mufflers today.
They are branded, just can't remember what brand.
And I'd estimate test would show approx 98-100db.
I love that you can still just hear the wastegate open.
Just....