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Product Details
| Part Number: | 31019-AH108 |
| Brand: | HKS |
| Body Type: | Hatchback |
Upgrade the sound, performance, and appearance of your 10th-generation Civic Hatchback with the HKS Hi-Power SPEC-L II Exhaust System, Part #31019-AH108. Engineered specifically for the 2017–2021 Honda Civic Hatchback (FK7), the SPEC-L II combines lightweight SUS304 stainless-steel construction, reduced exhaust backpressure, a sporty dual-exit design, and HKS's signature burnt-finish tips.
HKS developed the SPEC-L II around two major performance goals: reducing weight and improving exhaust efficiency. By using thin-wall stainless steel for the piping and silencers, HKS reduced system weight from approximately 17.5 kg (38.6 lb) for the factory exhaust to just 12.3 kg (27.1 lb)—a savings of approximately 30%.
Performance is further improved through HKS's straight-through silencer design. According to HKS, the SPEC-L II achieves approximately 40% lower backpressure than the factory exhaust, allowing the turbocharged engine to breathe more freely while delivering a deeper, sportier exhaust note under acceleration. At normal cruising speeds, the system is specifically tuned to reduce uncomfortable exhaust drone.
Features
- Designed specifically for the 2017–2021 Honda Civic Hatchback FK7
- Fits applicable 1.5L turbocharged Civic Hatchback models
- Genuine HKS Hi-Power SPEC-L II exhaust system
- HKS part number 31019-AH108
- Constructed from high-quality SUS304 stainless steel
- Lightweight thin-wall stainless-steel piping and silencers
- Weighs approximately 12.3 kg / 27.1 lb
- Factory exhaust weighs approximately 17.5 kg / 38.6 lb
- Approximately 30% lighter than the stock exhaust
- Straight-through silencer construction promotes efficient exhaust flow
- HKS reports approximately 40% lower backpressure compared with the factory exhaust
- Helps reduce exhaust restriction on the turbocharged 1.5L engine
- Provides a sporty, deep exhaust tone under acceleration
- Engineered to minimize uncomfortable drone during normal driving
- 60.5mm main center pipe transitions to dual 50.8mm piping
- Dual-exit rear exhaust configuration
- Large 94mm exhaust tips
- Signature HKS burnt-finish tips provide an aggressive JDM appearance
- Redesigned SPEC-L II configuration accommodates the updated 2020 Civic Hatchback bumper shape
- Also compatible with applicable 2017–2019 FK7 models
- Direct-fit, vehicle-specific construction
- Excellent choice for both daily-driven and modified Civic Hatchbacks
- Complements intake, intercooler, tuning, and other performance upgrades
- Japanese JQR certified under certification number JQR40213015
- Genuine HKS performance exhaust system
Lightweight SPEC-L II Construction
- Weight reduction is a major part of the SPEC-L philosophy. Rather than simply installing larger, heavier tubing, HKS uses carefully selected thin-wall stainless-steel material throughout the piping and silencer sections.
- The result is a complete system weighing approximately 12.3 kg (27.1 lb) compared with approximately 17.5 kg (38.6 lb) for the factory exhaust. That represents roughly a 30% reduction in exhaust-system weight.
- Removing more than 11 pounds from the vehicle while simultaneously increasing exhaust-flow capacity makes the SPEC-L II particularly attractive for enthusiasts who value both performance and weight reduction.
Reduced Backpressure & Improved Exhaust Flow
- HKS designed the Hi-Power SPEC-L II around a straight-through silencer structure rather than relying on a highly restrictive internal muffler arrangement.
- According to HKS testing, this design achieves approximately 40% lower backpressure than the stock exhaust system. Reduced restriction allows exhaust gases to travel more efficiently through the system, making the SPEC-L II a strong supporting upgrade for the Civic's turbocharged engine.
- The increased flow capacity is particularly useful when the vehicle is combined with additional modifications such as an intake, intercooler, ECU calibration, upgraded turbocharger, or other airflow improvements.
Sporty Sound Without Uncomfortable Drone
- A performance exhaust needs to sound good during acceleration without becoming tiresome during everyday driving. HKS specifically tuned the SPEC-L II with this balance in mind.
- Under acceleration, the system delivers a sporty, deeper bass-oriented exhaust note that gives the 1.5L turbocharged Civic considerably more character. During normal RPM operation and cruising, HKS designed the system to eliminate the uncomfortable booming or droning frequencies that can occur with less refined performance exhaust systems.
- HKS lists a 93 dB close-proximity exhaust noise level, compared with 83 dB for the factory exhaust under its certification testing conditions.
Signature HKS Burnt Tips
- The rear of the system is finished with large 94mm HKS exhaust tips featuring the recognizable heat-treated burnt appearance. The blue-gradient finish gives the Civic Hatchback a distinctly Japanese performance look while complementing the polished stainless-steel exhaust construction. Retail listings identify the outlets as 94mm titanium-style/burnt tips.
- The dual-tip configuration works with the Civic Hatchback's center-exit rear bumper layout and provides a significantly more aggressive appearance than the factory exhaust.
Product Specifications
- Manufacturer: HKS
- Part Number: 31019-AH108
- Series: Hi-Power SPEC-L II
- Product Type: Performance Exhaust System
- Vehicle: Honda Civic Hatchback
- Chassis: FK7
- Engine: L15-series 1.5L Turbo
- Main Material: S304 / SUS304 Stainless Steel
- Main Pipe Diameter: 60.5mm
- Rear Pipe Configuration: 50.8mm x 2
- Tip Diameter: 94mm
- Tip Configuration: Dual Exit
- Tip Finish: Burnt Finish
- HKS System Weight: 12.3 kg / approximately 27.1 lb
- Factory Exhaust Weight: 17.5 kg / approximately 38.6 lb
- Weight Reduction: Approximately 30%
- Backpressure Reduction: Approximately 40% vs. stock
- Factory Close Noise Level: 83 dB
- HKS Close Noise Level: 93 dB
- Minimum Listed Exhaust Clearance: 140mm with stock suspension under HKS's test conditions
- JQR Certification: JQR40213015
Vehicle Fitment
- 2017-2021 Honda Civic Hatchback 1.5T
- HKS's official Japanese application specifies the FK7 Civic Hatchback, L15C engine and a production range of September 2017 through August 2021. U.S. retailers catalog 31019-AH108 for the corresponding 2017–2021 Civic Hatchback 1.5L Turbo application.
Redesigned for 2020+ Bumper Compatibility
- Part number 31019-AH108 superseded the earlier 31019-AH107 design. HKS redesigned the SPEC-L II muffler positioning to accommodate the revised rear bumper shape used on the 2020 Civic Hatchback.
- Importantly, HKS states that the redesigned AH108 can also be installed on 2017–2019 models, making this the updated SPEC-L II configuration for the FK7 platform. HKS also notes compatibility with 2017–2019 DBA-FK7 vehicles equipped with the MUGEN rear under spoiler.
Installation & Fitment Note
- The HKS 31019-AH108 is an application-specific exhaust engineered around the FK7 chassis and factory mounting arrangement. Because bumper designs can vary by model year and market, HKS notes that rear bumper shape should be considered when confirming installation. The AH108 revision was specifically developed to accommodate both the later bumper configuration and applicable earlier FK7 models.
The HKS 31019-AH108 Hi-Power SPEC-L II Exhaust System is an excellent upgrade for the 2017–2021 Civic Hatchback owner looking for a premium combination of approximately 30% lower weight, approximately 40% reduced backpressure, SUS304 stainless construction, refined low-drone sound, and signature 94mm burnt HKS tips.
Due to the manufacturer's price control policy, this item may be excluded from promotions and discounts
WARNING: This product may contain chemicals known to the State of California to cause cancer or birth defects. www.P65Warnings.ca.gov.
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