HKS Hi-Power 409 JA12W/JA22W F6A/K6A JIMNY

Cat-Back Exhaust System Built for the Turbocharged Suzuki Jimny

The HKS Silent Hi-Power exhaust (31006-AS010) is a single-piece cat-back system engineered specifically for the Suzuki Jimny JA12W and JA22W with either the F6A or K6A turbocharged engine.

The silencer body and tip are constructed from polished SUS304 stainless steel for a durable, high-luster finish, while the piping section uses JASMA-approved SUH409 stainless steel. SUH409 absorbs sound more effectively than SUS304, enabling a straight-through internal design without producing excessive noise.

The result is an aggressive, motorsport-inspired exhaust note that remains within JASMA-certified sound limits. Adventex continuous fiber glass wool packing by Owens Corning is used internally for long-term acoustic performance. The 31006-AS010 replaces the restrictive factory exhaust path with a 50mm main pipe diameter and a 70mm polished tip, improving exhaust gas scavenging for the small-displacement turbo engine without requiring any secondary modification.

Key Features

• SUS304 stainless steel silencer body and polished tip for a corrosion-resistant, high-finish appearance
• SUH409 stainless steel piping resists heat expansion and provides improved acoustic damping for a refined sound profile
• JASMA certified for road use in Japan straight-through baffle design maximizes exhaust flow
• Advantex continuous fiber glass wool packing (Owens Corning) for lasting internal sound tuning
• 50mm main pipe diameter with 70mm tip OD single-piece construction for straightforward installation
• Close proximity sound level measured at 84dB on JA12W and 83dB on JA22W, both within JASMA limits
• Idle sound level of 67dB versus 59dB stock, producing a distinctive low-RPM note
• Direct-fit replacement for factory cat-back exhaust on JA12W and JA22W Jimny

This Part Fits

Product Specifications

What Is Included

• 1x HKS 31006-AS010 Silent Hi-Power cat-back exhaust system (single-piece assembly)
• Hardware and gaskets for installation (as per HKS kit contents for this application)

Frequently Asked Questions

Will the HKS 31006-AS010 fit both the F6A and K6A turbo Jimny models?

Yes. The 31006-AS010 is designed for the Suzuki Jimny JA12W (F6A Turbo) and the JA22W (K6A Turbo). Both chassis share a compatible exhaust layout for this application.

Confirm your chassis code before ordering, as the naturally aspirated Jimny variants use a different exhaust routing and are not compatible with this system.

Is the HKS 31006-AS010 street legal in Japan?

Yes. This system is JASMA certified, which is the standard for road-legal aftermarket exhaust in Japan. The close-proximity sound level on the JA22W measures 83dB with the HKS system versus 84dB from the factory, making it quieter at full throttle while producing a more aggressive idle and mid-range tone at 67dB versus 59dB stock.

What is the difference between SUH409 and SUS304 stainless steel in this exhaust?

SUS304 (304 stainless) is used on the silencer body and polished tip because it provides a high-luster appearance and excellent corrosion resistance in exposed areas. SUH409 is used on the hidden piping section because it is more resistant to thermal expansion cycles and absorbs sound more effectively than SUS304, which is why the 31006-AS010 can use a straight-through internal design without producing excessive noise levels.

Does the 31006-AS010 include a mid-pipe or is it a rear silencer replacement only?

The 31006-AS010 is a full single-piece cat-back assembly for the Jimny JA12W and JA22W. The kit is listed as consisting of one piece, covering the section from the catalytic converter outlet rearward. It replaces the factory center section and rear silencer as a single integrated unit.

Will the HKS 31006-AS010 work with an aftermarket front pipe or catalytic converter?

The 31006-AS010 connects at the factory catalytic converter outlet flange. Provided the aftermarket front pipe or cat retains the standard outlet flange diameter and bolt pattern for the JA12W or JA22W, this system should mate correctly. Always confirm flange specifications with the front pipe manufacturer if combining aftermarket exhaust components.

How much louder is this exhaust compared to stock at idle?

At idle, the HKS system measures 67dB versus 59dB from the factory, an increase of 8dB. A difference of 6 to 10dB is generally perceived as roughly twice as loud to the human ear. The increase is most noticeable at idle and light throttle rather than at full throttle, where the close-proximity measurement shows only a minor change from stock levels.

Does the HKS Hi-Power 409 system require professional installation on the Jimny?

The 31006-AS010 is a bolt-on replacement using the factory flange and hanger locations. A basic understanding of exhaust removal and installation, jack stands, and hand tools is sufficient for a capable home mechanic. If exhaust hardware is heavily corroded due to age or climate, professional installation is recommended to avoid broken studs.

What warranty does HKS provide on the 31006-AS010?

HKS provides a manufacturer warranty covering defects in materials and workmanship on this exhaust system. Under the Magnuson-Moss Warranty Act, installation of an aftermarket exhaust system on your vehicle cannot by itself void the manufacturer warranty on unrelated vehicle systems. Contact HKS or your authorized HKS dealer for specific warranty claim procedures.

Is the Advantex glass wool packing user-replaceable when it wears out?

On the HKS Hi-Power 409 series, the Advantex continuous fiber glass wool packing by Owens Corning is integrated into the silencer at the factory. Most owners do not encounter packing degradation under normal street use for many years. If packing replacement ever becomes necessary, contact an HKS authorized service center for guidance, as re-packing procedure varies by silencer construction.

Installation Instructions

• Allow the factory exhaust system to cool completely before beginning removal.
• Safely lift and support the vehicle on jack stands at the designated chassis lift points.
• Apply penetrating oil to all exhaust flange bolts and hangers 10 to 15 minutes before removal to ease disassembly.
• Disconnect the factory cat-back section at the catalytic converter outlet flange, removing the flange bolts and gasket.
• Unhook the factory exhaust rubber hangers from the body mounts to free the system from the vehicle.
• Transfer any usable rubber hangers to the HKS 31006-AS010 hanger locations if the factory hangers are in good condition.
• Position the HKS exhaust system under the vehicle and align the front flange with the catalytic converter outlet, using a new gasket.
• Hook all rubber hangers onto their corresponding chassis mount points before torquing any flanges, allowing the system to hang freely and find its natural position.
• Torque the inlet flange bolts to factory specification (approximately 35 to 40 Nm on most Jimny applications); confirm all hangers are properly seated.
• Start the engine and inspect all flange connections and hanger points for exhaust leaks before driving. Recheck after the first heat cycle.