CURRENT RULEHawaiiRepair / customer rights✓ Human reviewed

Does your Hawaii exhaust work comply with the muffler law?

Hawaii motor-vehicle repair law lists repairing or installing a muffler or exhaust system that fails to comply with HRS 291-24 or 291-24.5 as a prohibited practice. State inspection law also requires covered safety inspections to reject vehicles or mopeds with noncompliant noisy muffler or exhaust systems, with permit consequences for repeated willful inspection-station violations.

Quick check

Make sure repaired or installed mufflers do not violate HRS 291-24/291-24.5, and inspection stations reject noncompliant noisy systems as required.

At a glance

JurisdictionHawaii

TopicRepair / customer rights

VerifiedOct 4, 2026

Review cadenceOngoing; re-check when Hawaii muffler, repair-industry, or periodic-inspection rules change.

When this applies

Your Hawaii shop repairs or installs mufflers or exhaust systems, or operates an official safety inspection station.

Do not install or repair an exhaust system into a configuration prohibited by HRS 291-24 or 291-24.5. If you operate an inspection station, make sure inspection procedures identify noncompliant muffler/exhaust systems.

Official evidence

Source and verification

Official source: Hawaii Legislature — HRS §437B-11 and Act 172 (2025) ↗
Additional official source ↗
Verified: Oct 4, 2026
Applies to: General mechanical, Inspection / emissions, Mixed services, Dealership fixed ops

Quick-reference compliance planning only; not legal advice or an exhaustive statement of every applicable Federal, state, or local rule. Always verify the official source.

Does your Hawaii exhaust work comply with the muffler law?

Your Hawaii shop repairs or installs mufflers or exhaust systems, or operates an official safety inspection station.

Source and verification

Related Hawaii changes