Proposal to introduce provisions for stationary noise measurements on a single-sided dual exhaust system, minimize proliferation of approval numbers from models with differences in vehicle exhaust and silencing systems, and correct an omission regarding the compensating resevoir fill time thereby aligning UN R41 with the other noise UN Regulations Nos. 9, 51 and 63.
| GRBP/2019/24 | |
| GRBP/2019/25/Rev.1 | |
| GRBP-71-10 | |
| GRBP-71-18/Rev.2 |