Akrapovic "Quiet" Link Pipe for '21 RSV4 Full System - L-A10E11-TD
You might need this link pipe if you have theĀ Akrapovic Full System fitted to your bike, but are running at a track with a dB limit.
From Akrapovic's website:
Static noise level of Evolution Line: 103,2 dB at 5500 rpm
Static noise level of Evolution Line with "Quiet" Track Day Link Pipe: 100,4 dB at 5500 rpm