違い法ほう改かい造ぞう

noun

illegal modification; illegal tuning

Commonly used for illegal modifications to vehicles (cars, motorcycles, etc.), but can also refer to other illegal customizations.

• 違い法ほう改かい造ぞうされた車くるまは公こう道どうを走はしれない。

  Illegally modified vehicles cannot be driven on public roads.

• 警けい察さつは違い法ほう改かい造ぞう車しゃの取とり締しまりを強きょう化かしている。

  The police are cracking down on illegally modified vehicles.