HKS LEGAMAX Premium 16-21 HONDA CIVIC SEDAN FC (31021-BH004)

Regular price $1,275.00 USD Sale price $1,275.00 USD Regular price $1,500.00 USD
Sale 15.0% $225.00 USD (15.0%)
Special order - Ships in 5+ weeks
SKU: hks31021-BH004
Product Description

The exhaust pressure is reduced to 50% of the stock level by using 60 big-diameter pipes and a full straight structure. This large drop in exhaust pressure allows the turbine to run smoothly from the low RPM range, resulting in an improvement in engine power over the whole speed range. This pressure reduction effect is also strengthened as the tuning level advances; the engine output can be increased to 450ps without sacrificing engine power.

NOTES: For a vehicle equipped with HKS suspension


  • HONDA CIVIC 4D (2016, 2017, 2018, 2019, 2020, 2021)


  • The shape of the muffler: Ti Tip (LEGAMAX Premium)
  • Main material: SUS304(*2)
  • Diameter of tip: 75
  • Diameter of the center pipe: 60(50)(*3)
  • Close noise level: Stock 72, HKS 79
  • About road clearance(*4): Clearance 120

To provide faster delivery and turn around time; Kami Speed ships products out from different warehouses throughout the United States. Usually averaging 1-4 business days for processing prior to shipping.

Depending on the package, we ship using different carriers according to the item's location, content, and size.

Freight truck & international items, will require up to 7 business days to ship due to size and logistics.

All orders made after 3:00pm ET will be shipped or processed the next business day.

Unless otherwise noted as "In Stock" or exact ETA. Special Order items have an ETA of 5+ weeks.

Orders over $500 will ship insured and over $1,000 with signature and insurance in order to guarantee delivery. Orders over $1000 may not be able to ship to a different address not listed as the billing address or confirm payment address from the form of payment used. Orders with suite numbers, different billing, or apartment numbers will require signature if valued over $100.

All international orders outside of the USA are subject to duties and taxes fees per your countries jurisdiction and determined by customs.
Kami Speed serves the right to ship using an alternative method if we see it fit, in order to expedite shipping and reduce your rate depending on product value.

Processing and logistics on in stock international orders can take up to 7 business days to process & ship.

In stock, non special order items can be returned within 30 days of the product arriving to your house or place of work.
Returns will NOT be accepted on Clearance Items, Final Sales, Special Orders, Opened, Installed, Incomplete, or Otherwise Used Products. In order to initiate a return, an RMA number must be requested and approved via e-mail. All returns will be subject to a 20% restocking fee minus complete shipping cost (roundtrip).

Any processed orders that have not shipped will incur a 6% cancelation refund fee unless the product was not available to ship within a timely manner. No fee will be incurred if used as store credit.

For complete details on our return policy, please see our Help and FAQ link under HELPFUL INFO.

WARNING: Operating, servicing and maintaining a passenger vehicle or off-highway motor vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. For more information go to

Customer Reviews

Based on 1 review
Mathias M. (Graz, 6, AT)
Fancy Exhaust, easy install.

Almost perfect fit. Middle rubber mount won’t fit on european model. Little drone. Nice deep rumble on low rpms. Look is awesome. Quality level: Japan.