Been testing a few of those free apps for testing my exhaust.
Calibrated them as advised then checked the bikes note.
With a set of Freedom 4" Racing pipes with no quiet baffle inserted the results were.
Idle 1000 rpm 86 Db.
2500 rpm 86 Db.
4000 rpm 86 Db.
One of my farts coz I couldn't resist testing it 82 Db. LOL
LOL, no pipes inserted. Straight from the exhaust port.
Mind you there was a particular good Vindaloo involved from the previous night, that may have helped as well.