Which Civic models does the LEGAMAX Premium Exhaust for FC1 fit?

HKS lists the LEGAMAX Premium Exhaust for FC1, part 31021-BH004, for the 2016-2021 Civic sedan with the 1.5L turbo L15B7, and notes it is the version for cars sold in the US. The 2.0L sedan, the FK7 hatchback and the coupe are not covered by this part, and Civic Si sedan owners should confirm fitment with Bulletproof Automotive first.

How loud is the LEGAMAX Premium compared to the factory exhaust?

HKS measured 79 dB against 72 dB for the factory system on its close test. That 7 dB rise gives the sedan a clearly sportier voice at startup and under throttle than stock, and HKS does not publish a cruise figure for part 31021-BH004, so drone on the highway cannot be quoted.

Does the Civic need a tune after this exhaust is installed?

No. HKS lists no tuning requirement for part 31021-BH004, and the kit includes no engine management. HKS says halving the exhaust pressure lets the stock turbo spin up more freely from low engine speeds, and the benefit grows on a tuned car, so the system can stay on as a build develops.

What does the kit include?

HKS supplies two mid pipes and left and right rear mufflers, each muffler finished with twin 75mm titanium tips, along with the gaskets, bolts, nuts and washers needed at each joint. The factory rubber hangers and the factory nuts at the front flange are reused.

How much ground clearance does the system leave?

HKS lists 120mm of minimum clearance between the kit and the road, measured on a car fitted with HKS suspension. Clearance on a given car can differ, so owners on lower springs or coilovers should check the gap under the mufflers before daily use.

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Description

HKS LEGAMAX Premium Exhaust for FC1 Honda Civic

HKS’s LEGAMAX Premium Exhaust for FC1 Honda Civic Sedan gives the 1.5L turbo L15B7 a full straight SUS304 stainless system and a rear view finished with four 75mm titanium tips, two at each corner. A 60mm center pipe and full straight silencers bring exhaust pressure down to half the factory figure, which HKS says lets the small turbo respond from low engine speeds. At 79 dB against 72 dB stock it is the refined choice for a sedan that is driven every day, where a clear, finished note matters more than outright volume.

Features

Full straight silencer structure that halves exhaust pressure compared to the factory system
Four 75mm titanium tips, a pair on each rear muffler
SUS304 stainless steel mid pipes and mufflers
Two-piece mid section with ring gaskets at each joint, reusing the factory rubber hangers

Specifications

Center Pipe Diameter: 60mm at its largest section
Tips: 75mm titanium, two per side
Main Material: SUS304 stainless steel
Exhaust Pressure: 50% of the factory system
Sound Level, Factory System: 72 dB, HKS measurement
Sound Level, HKS: 79 dB, HKS measurement

Applications

Honda Civic: FC1 | 2016-2021 | L15B7

Notes

HKS lists the LEGAMAX Premium Exhaust for FC1 for the 1.5L turbo Civic sedan in its US-market form; the 2.0L sedan, hatchback and coupe are not covered
Civic Si sedan owners should look at the HKS Hi-Power Exhaust for FC1 Civic Si Sedan (31006-BH002), which HKS catalogs for the Si, and confirm fitment with Bulletproof Automotive before ordering this part
HKS notes that hangers, brackets and stays may change without prior notice

Frequently Asked Questions

Which Civic models does the LEGAMAX Premium Exhaust for FC1 fit? HKS lists the LEGAMAX Premium Exhaust for FC1, part 31021-BH004, for the 2016-2021 Civic sedan with the 1.5L turbo L15B7, and notes it is the version for cars sold in the US. The 2.0L sedan, the FK7 hatchback and the coupe are not covered by this part, and Civic Si sedan owners should confirm fitment with Bulletproof Automotive first.
How loud is the LEGAMAX Premium compared to the factory exhaust? HKS measured 79 dB against 72 dB for the factory system on its close test. That 7 dB rise gives the sedan a clearly sportier voice at startup and under throttle than stock, and HKS does not publish a cruise figure for part 31021-BH004, so drone on the highway cannot be quoted.
Does the Civic need a tune after this exhaust is installed? No. HKS lists no tuning requirement for part 31021-BH004, and the kit includes no engine management. HKS says halving the exhaust pressure lets the stock turbo spin up more freely from low engine speeds, and the benefit grows on a tuned car, so the system can stay on as a build develops.
What does the kit include? HKS supplies two mid pipes and left and right rear mufflers, each muffler finished with twin 75mm titanium tips, along with the gaskets, bolts, nuts and washers needed at each joint. The factory rubber hangers and the factory nuts at the front flange are reused.
How much ground clearance does the system leave? HKS lists 120mm of minimum clearance between the kit and the road, measured on a car fitted with HKS suspension. Clearance on a given car can differ, so owners on lower springs or coilovers should check the gap under the mufflers before daily use.

About HKS

HKS is a Japanese performance engineering brand founded in 1973 and headquartered in Fujinomiya, Shizuoka, with a long-standing reputation for developing high-quality aftermarket parts and motorsport-proven technology for enthusiast and professional applications. Known for innovations in turbocharging and engine performance, HKS produces a broad range of components including exhaust systems, turbo kits, electronics / engine management, and suspension solutions, with product development heavily influenced by decades of involvement in racing disciplines such as circuit time attack, drag, and drifting.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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HKS LEGAMAX Premium Exhaust for FC1 Honda Civic [31021-BH004]

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HKS LEGAMAX Premium Exhaust for FC1 Honda Civic

Features

Specifications

Applications

Notes

Frequently Asked Questions

About HKS

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