Australia Post International Freight & Prepaid U.S. Customs Duties – USA

Important: This listing is for the payment of Australia Post international freight together with applicable prepaid U.S. Customs duties, tariffs and clearance fees for a specific consignment arranged by Best Mufflers.

Do not purchase this item unless you have been specifically directed to do so by Best Mufflers. The amount shown has been calculated specifically for your order and shipment to the United States.

What This Payment Includes

• Australia Post International shipping charges for your specific consignment.
• Applicable U.S. Customs import duties and tariffs.
• Applicable Zonos clearance and administration fees.

Once payment has been received, your shipment will be processed and an Australia Post consignment/tracking number will be issued. Tracking details will be provided once your order has been dispatched.

Checkout Note: During the checkout process, please disregard any automated freight or shipping notifications. The freight charges for this consignment are already included in this listing.

Why U.S. Customs Duties Must Be Prepaid

Effective 29 August 2025, the United States suspended the previous USD $800 de minimis duty-free exemption for imported goods. Applicable U.S. import duties and tariffs may therefore apply regardless of the value of the shipment.

For eligible postal shipments sent through Australia Post, applicable duties are calculated and collected through Zonos prior to dispatch and remitted for U.S. Customs clearance.

From 24 July 2026, U.S. Customs duties for postal shipments are calculated according to the applicable 10-digit HS tariff code, Country of Origin (COO), declared customs value and any additional tariffs applicable to the product.

Typical Duty Rates for Automotive Exhaust Parts

• Automotive exhaust parts may be subject to different U.S. import charges depending on their customs classification and vehicle application.
• Qualifying automobile exhaust parts may be subject to a 25% Section 232 Automobile Parts Additional Duty.
• A 2.5% General Import Duty is also typically applicable to qualifying mufflers, exhaust pipes and parts classified under HTSUS 8708.92.
• Where both rates apply, the combined customs duty is approximately 27.5% of the applicable customs value.
• Zonos clearance and administration fees are additional to the customs duty and are included in the amount quoted by Best Mufflers.
• The final customs amount is calculated through Zonos using the applicable U.S. tariff classification, Country of Origin, customs value and exchange rates at the time the shipment is processed.

How It Works

• Best Mufflers calculates the applicable Australia Post freight charges for your consignment.
• The applicable U.S. Customs duties, tariffs and clearance fees are calculated through the Australia Post / Zonos system.
• The combined amount for freight and prepaid U.S. import charges is then added to this listing specifically for your order.
• Once payment is received, your order will be released for shipment to the United States.
• Applicable duties are remitted through Zonos for U.S. Customs processing.
• Your Australia Post tracking details will be supplied after dispatch.

Important Notes

• This listing cannot be purchased independently or without direction from Best Mufflers.
• The amount charged applies only to the specific order and consignment for which it was calculated.
• U.S. tariff rates vary according to the product, 10-digit HS tariff code, Country of Origin, customs value and vehicle application.
• The 27.5% combined duty rate does not apply to every automotive or exhaust product. It applies where the relevant 25% Section 232 automobile-parts duty and 2.5% general import duty are both applicable.
• Zonos clearance and administration fees are additional to U.S. Customs duties and are included in the prepaid amount quoted by Best Mufflers.
• Tariff rates, customs regulations, exchange rates and clearance charges are subject to change.
• Customs duties and associated processing fees may be non-refundable once the shipment has been processed.

Customer Support

For assistance with U.S. customs, freight or payment instructions – contact us: