How loud is the HKS Hi-Power Muffler for FL5?

HKS records 93dB at idle for the Hi-Power Muffler for FL5 against 80dB for the factory system, a 13dB increase. The bullet-shaped main silencer and valveless structure raise sound pressure across the whole frequency range, so the treble is as present as the bass. It is the louder of the two HKS systems for this chassis.

How does it differ from the HKS LEGAMAX Sports?

Both share the 74.7mm valveless path stepping to twin 60.5mm outlets and both cut exhaust pressure about 30 percent. The difference is the silencer: the Hi-Power uses a bullet-shaped main silencer that lifts sound pressure everywhere, while the LEGAMAX Sports stays more restrained. The Hi-Power is also heavier at 26.5kg.

How much power does it add?

HKS measured power above the factory figure from 5000 to 6000rpm with a maximum gain of 3.6kW, and torque up by as much as 7.5Nm near 3000rpm. Because the factory ECU manages output on a torque model, HKS states the larger gains arrive only after an ECU remap raises boost.

Will it trigger a check engine light with the factory valves removed?

No. A dedicated actuator for the factory valve motor is included, and the factory motor mounts to it and continues to move as designed. HKS warns that on the FL5 a valve motor left idling or removed records fault codes in the OBD memory even though the check engine light does not illuminate.

What is the Hi-Power Muffler for FL5 made from?

The Hi-Power Muffler for FL5 uses S3 and S4 stainless steel for the silencer and pipework, with a titanium tail finished at 119mm carrying the HKS logo. The centre pipe measures 74.7mm and steps down to twin 60.5mm outlets. Minimum clearance to the road measures 125mm on factory suspension.

Does it fit alongside the HKS body kit and ducktail?

Yes. The system exits through the factory bumper aperture and does not interfere with the HKS Body Kit rear bumper spoiler or ducktail spoiler. Installation replaces the factory front splash guard section, and HKS lists no bodywork modification for this exhaust.

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Description

HKS Hi-Power Muffler for FL5 Honda Civic Type R

HKS’s Hi-Power Muffler for FL5 Honda Civic Type R is the loud one. Where the LEGAMAX Sports keeps its voice measured, the Hi-Power pairs the same valveless 74.7mm straight-through path with a bullet-shaped main silencer, and the difference is audible everywhere: HKS records higher sound pressure across the entire frequency range, with the treble as present as the bass. Exhaust pressure still falls by roughly 30 percent compared to the factory system, a 119mm titanium tail carries the HKS logo, and the dedicated actuator for the factory valve motor is included so the car records no fault codes with the valves gone.

Design and Performance

The 75mm full-straight structure carries no valves, flaps or restrictions, and the Hi-Power Muffler for FL5 runs 74.7mm into twin 60.5mm outlets at every rpm. HKS measured power above the factory figure from 5000 to 6000rpm with a maximum gain of 3.6kW, and torque up by as much as 7.5Nm around 3000rpm before exceeding the factory curve again from 5000 to 6000rpm. Exhaust pressure drops about 30 percent, which HKS states is where further gains come from once the ECU is remapped, since the factory ECU manages output on a torque model and caps what an exhaust alone can deliver.

Construction

Main silencer and pipework are S3 and S4 stainless, with a bullet-shaped main silencer chosen for its sound character rather than packaging convenience. The tail is titanium at 119mm with the HKS logo, and the kit replaces the factory front splash guard section as part of the install. At 26.5kg the assembly is substantial, and HKS ships it as a single long crate.

Features

Bullet-shaped main silencer gives the Hi-Power Muffler for FL5 higher sound pressure across the whole frequency range, not just the bass
Valveless straight-through structure with no internal restrictions
Louder and more aggressive than the LEGAMAX Sports on the same chassis
Titanium tail with the HKS logo pressed into the face
Dedicated actuator for the factory valve motor included
The Hi-Power Muffler for FL5 leaves exhaust-side headroom for an ECU remap

Specifications

Tail diameter: 119mm, titanium
Centre pipe diameter: 74.7mm stepping to 60.5mm x 2
Main material: S3 and S4 stainless steel
Product weight: 26.5kg
Minimum road clearance: 125mm (measured on factory suspension)
Noise level at idle: 93dB (factory system 80dB)

What’s Included

HKS Hi-Power muffler system
Dedicated actuator for the factory valve motor

Applications

Honda Civic Type R: FL5 | 2023-present | K20C

Notes

The Hi-Power Muffler for FL5 ships as a single crate measuring 1515 x 600 x 335mm at 26.5kg
The included actuator replicates the factory valve mechanism so the factory motor still moves as designed. HKS notes that on the FL5 a motor left idling or removed records fault codes even though the check engine light does not illuminate.
This is the louder of the two HKS systems for the chassis. Anyone who drives long highway miles should read the 93dB idle figure against the 80dB factory system before committing.
Power and torque figures were recorded by HKS on a Japan-market FL5, which leaves the factory with a different output rating from the US car
The HKS Power Editor for the FL5 (part number 42018-AH013) is what converts the flow gain into output, and Bulletproof Automotive does not currently stock it
For a more restrained note with the same pipe diameters, compare the HKS LEGAMAX Sports Exhaust for FL5 Honda Civic Type R 31021-AH005
Browse the full HKS range on Bulletproof Automotive

Frequently Asked Questions

How loud is the HKS Hi-Power Muffler for FL5? HKS records 93dB at idle for the Hi-Power Muffler for FL5 against 80dB for the factory system, a 13dB increase. The bullet-shaped main silencer and valveless structure raise sound pressure across the whole frequency range, so the treble is as present as the bass. It is the louder of the two HKS systems for this chassis.
How does it differ from the HKS LEGAMAX Sports? Both share the 74.7mm valveless path stepping to twin 60.5mm outlets and both cut exhaust pressure about 30 percent. The difference is the silencer: the Hi-Power uses a bullet-shaped main silencer that lifts sound pressure everywhere, while the LEGAMAX Sports stays more restrained. The Hi-Power is also heavier at 26.5kg.
How much power does it add? HKS measured power above the factory figure from 5000 to 6000rpm with a maximum gain of 3.6kW, and torque up by as much as 7.5Nm near 3000rpm. Because the factory ECU manages output on a torque model, HKS states the larger gains arrive only after an ECU remap raises boost.
Will it trigger a check engine light with the factory valves removed? No. A dedicated actuator for the factory valve motor is included, and the factory motor mounts to it and continues to move as designed. HKS warns that on the FL5 a valve motor left idling or removed records fault codes in the OBD memory even though the check engine light does not illuminate.
What is the Hi-Power Muffler for FL5 made from? The Hi-Power Muffler for FL5 uses S3 and S4 stainless steel for the silencer and pipework, with a titanium tail finished at 119mm carrying the HKS logo. The centre pipe measures 74.7mm and steps down to twin 60.5mm outlets. Minimum clearance to the road measures 125mm on factory suspension.
Does it fit alongside the HKS body kit and ducktail? Yes. The system exits through the factory bumper aperture and does not interfere with the HKS Body Kit rear bumper spoiler or ducktail spoiler. Installation replaces the factory front splash guard section, and HKS lists no bodywork modification for this exhaust.

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 Hi-Power Muffler for FL5 Honda Civic Type R [31006-KH001]

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HKS Hi-Power Muffler for FL5 Honda Civic Type R

Design and Performance

Construction

Features

Specifications

What’s Included

Applications

Notes

Frequently Asked Questions

About HKS

Reviews