Delkevic mufflers are designed to work with stock tuning for a plug and play modification. All mufflers are listed from loudest to quietest.
Please check your local laws and any laws where you ride. Due to the worldwide distribution of our products Delkevic does not make any representation our products comply with noise or emission laws of any country except those of the United Kingdom. Please investigate your local laws and any laws in areas you may be riding. Mufflers 13" (320mm) and longer have a BSAU stamp for street legal under British Standards. Custom Cruiser mufflers 16" and 21" do not have BSAU stamps and are not considered road legal in the UK.