IWG RD-ASEP created a mandatory test assessing compliance with paragraph 6.2.3 of Regulation 51.03 (later 51.04) to assure vehicle noise emission at speed, load, or acceleration conditions other than Annex 3 condition is linked to vehicle physics, with no noise emission test detection or defeat device schemes. R51.04 draft incorporates R51.03 Supplements up to Supplement 11, revises manipulation and defeat device provisions, establishes mandatory random RD-ASEP testing for approval with expanded vehicle speed range of 1-100 km/h and vehicle performance criteria, and includes expectation model technical basis in Annex 7.