DB Killer Type 3
The next door neighbour is always telling you that your bike is TOO LOUD ! ( we know right! ).
The DB-killers type 3 is the best way to "fix" that issue, and keeps the neighbours happy.
DB Killer Type 3 comes in 5 different sizes
Diameter Big: 35mm, 40mm, 45mm, 48mm and 60mm
Diameter Small: 25mm
Material: Galvanised steel
(please leave the size you are looking for in the comments)