II.

EXHAUST SYSTEM (SILENCER) II.1. If the vehicle is fitted with a device designed to reduce the exhaust noise (silencer), the requirements of item II shall apply. If the inlet of the engine is fitted with an air filter which is necessary in order to ensure compliance with the permissible sound level, the filter shall be considered to be part of the silencer, and the requirements of item II shall also apply to that filter. II.2. A drawing of the exhaust system shall be annexed to the vehicle type approval certificate. II.3. The silencer must be marked with a reference to its make and type which is clearly legible and indelible. II.4. The use of fibrous absorbent material is permitted in the construction of silencers only if the following conditions are fulfilled: II.4.1. The fibrous absorbent material may not be placed in those parts of the silencer through which the gases pass. II.4.2. Suitable devices must ensure that the fibrous absorbent material is kept in place for the whole time that the silencer is being used. II.4.3. The fibrous absorbent material must be resistent to a temperature at least 20 % higher than the operating temperature which may occur in the region of the silencer where these fibrous absorbent materials are situated.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-02 · Text as adopted (Official Journal); later amendments are not incorporated in this text.