Proposal is to correct an omission regarding the compensating resevoir fill time thereby aligning UN R41 with the other noise UN Regulations Nos. 9, 51 and 63.

Proposal to allow multiple exhaust and/or silencing system configurations to be explicitly listed under the same motorcycle type approval in order to reduce redundancy and number of separate approvals and documentation.

Proposal to minimize proliferation of approval numbers from models with differences in vehicle exhaust and silencing systems.