EFFECTIVEHawaiiJun 3, 2025High priority✓ Human reviewed

Hawaii made noncompliant muffler installation a repair-shop violation

Hawaii Act 172, approved June 3, 2025, added repairing or installing a muffler or exhaust system that fails to comply with HRS §291-24 or §291-24.5 to the motor-vehicle repair industry's prohibited practices. The act also tied periodic safety inspection certificates to compliant muffler/exhaust systems and added permit consequences for repeated willful inspection-station violations.

mufflerexhaustinspectionrepair shopnoise
What to check

Hawaii repair shops should not install or repair exhaust systems into a prohibited noisy configuration, and safety-inspection stations should make sure their inspection procedure catches noncompliant muffler or exhaust systems.

At a glance
LifecycleEffective
EffectiveJun 3, 2025
VerifiedOct 4, 2026
Official evidence

Source and verification

Verified
Oct 4, 2026

Informational only; not legal advice. We summarize the regulatory update and link directly to the official source so you can verify it.

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