Removing the noise-reduction mechanism from a muffler is not treated as a modification that seriously impairs the muffler's function.

マフラー（消音器）の騒音を減らす仕組みを取り外しても、法令で定める「消音器の機能に著しい支障を及ぼす改造等」には含まれない。

This statement is FALSE

Explanation

Item 2 of the regulation expressly lists "removing the muffler's noise-reduction mechanism" as such a modification, so saying it is not included is wrong.

Original text

二　消音器の騒音低減機構を除去すること。　三　消音器に排気口以外の開口部を設けること。

Source: Regulation for Enforcement of the Road Traffic Act — 道路交通法施行規則第九条の四の三（消音器の機能に著しい支障を及ぼす改造等） · Prime Minister's Office Ordinance No.60 of 1960

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Removing the noise-reduction mechanism from a muffler is not treated as a modification that seriously impairs the muffler's function.

Explanation

Original text

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