Ch. 8 · Motorcycles

Removing the muffler core or drilling holes in the muffler reduces noise, so such modifications are prohibited.

[True / False · Medium]

Answer: ✕ False

Explanation

The text states that "removing the muffler core or drilling holes in the muffler increases noise." The statement is incorrect because such modifications "increase" noise rather than "reduce" it, which is why they are prohibited.

Driving school curriculumStage 1 – Topic 1: Driver's mindset

Momoka
Momoka
So drilling holes in the muffler reduces noise—that's why it's banned, right?
Hikari
Hikari
Actually, that's false. Drilling holes or removing the core increases noise, which is exactly why it's prohibited.
Momoka
Momoka
Oh! I had it backwards—more holes means louder, not quieter.
Hikari
Hikari
Exactly. Keep the muffler intact to stay legal and keep the peace.

Source: Ch. 8 Motorcycles · Section (第６節 その他注意しなければならないこと) · １ 改造の禁止 - マフラーのしんを抜いたり、マフラーに穴を開けたりすると騒音が大きくなるので、このような改造をしてはいけません。

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Source content excerpted from the NPA “Rules of the Road” instructional manual, in the public domain under Japanese Copyright Act Article 13(2). Explanations are AI-assisted and copyrighted by the MenkyoQuest editorial team.