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Loud exhaust systems are illegal in Japan under the Road Traffic Act, enforced by the National Police Agency. Modified exhausts exceeding 92 dB(A) trigger penalties, including fines up to ¥100,000 or vehicle confiscation. Local ordinances in Tokyo, Osaka, and Kyoto impose stricter decibel limits, with 2026 revisions tightening enforcement via AI-powered noise detection.
Key Regulations for Loud Exhausts in Japan
- Decibel Limits: Original equipment exhausts must comply with JIS D 1616 standards (≤92 dB(A)). Aftermarket systems exceeding this require certification under the Noise Regulation Law.
- Local Ordinances: Municipalities like Tokyo ban exhausts emitting over 85 dB(A) in residential zones, with police deploying handheld sound meters for spot checks.
- Modification Penalties: Violations incur fines up to ¥100,000 (¥50,000 for first offenses) and mandatory exhaust replacement. Repeat offenders face vehicle impoundment under the Act on Maintenance of Road Traffic Order.
Enforcement escalates in 2026 with nationwide deployment of acoustic sensors integrated into traffic cameras, targeting high-noise vehicles in urban corridors. Owners of non-compliant vehicles must submit modification certificates to regional transport bureaus or risk registration suspension.