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Exhaust or silencing apparatus characterised by constructional features {; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups [CPC: F01N1/00] - [CPC: F01N5/00], [CPC: F01N9/00], [CPC: F01N11/00]} having two or more silencers in parallel, e.g. having interconnections for multi-cylinder engines