HKS Hi-Power Cat-Back Exhaust for FL5 Civic Type R (31006-KH001)
HKS Hi-Power Cat-Back Exhaust for FL5 Civic Type R (31006-KH001)
HKS
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PRODUCT DETAILS ▾
The HKS Hi-Power cat-back exhaust (part 31006-KH001) is a valveless, straight-through exhaust for the 2023+ Honda Civic Type R (FL5, K20C). It is the loud, free-flowing option in the HKS lineup: about 30% less exhaust back pressure than the factory system and roughly 13 dB more sound than stock.
Fitment
- Honda Civic Type R FL5, 2023 and newer (K20C engine)
- Not for the FK8 Civic Type R or non-Type R Civics
Specifications
- Manufacturer part number: 31006-KH001
- Design: valveless, full straight-through (HKS "Hi-Power" type), bullet-shaped main silencer
- Piping: 74.7mm center pipe splitting into dual 60.5mm pipes
- Tip: 119mm titanium with HKS logo
- Weight: 26.5 kg (system)
- Minimum ground clearance: 125mm on stock suspension (lowered cars will be lower)
Performance and sound (HKS in-house testing)
- Exhaust back pressure about 30% lower than stock
- Up to +3.6 kW (about +4.8 hp) between 5,000 and 6,000 rpm, and up to +7.5 Nm torque around 3,000 rpm
- Idle sound: 93 vs 80 on the stock system. Overall about 13 dB louder than stock and about 9 dB louder than the HKS Legamax Sports
- On a stock ECU, peak output is limited to stock levels because the factory ECU manages torque. A tune unlocks more of the gain.
What's in the box
- Complete cat-back exhaust
- Dedicated actuator that works with the factory exhaust valve motor to avoid fault codes
Good to know
If the factory valve motor is removed or disconnected, the car stores a fault code (the check engine light does not come on). This exhaust is significantly louder than stock, so check your local noise laws before buying.
FAQ
Is the HKS Hi-Power louder than the stock FL5 exhaust?
Yes. HKS measures it about 13 dB louder overall than the factory exhaust.
Does it need a tune?
No, it bolts on and runs on the stock ECU. A tune is needed to see peak power gains, because the factory ECU limits torque.
Will it set a check engine light?
Not when installed with the included actuator and the factory valve motor connected.
How long does shipping take?
Delivery times vary by part because many items ship directly from the manufacturer or distributor. Message us before ordering and we'll confirm current lead time.
Can I return it?
Yes. Returns are accepted within 30 days of delivery. The customer pays return shipping, and a restocking fee of up to 20% may apply.
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WHAT TO EXPECT ▾
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The HKS Hi-Power cat-back exhaust (part 31006-KH001) is a valveless, straight-through exhaust for the 2023+ Honda Civic Type R (FL5, K20C). It is the loud, free-flowing option in the HKS lineup: about 30% less exhaust back pressure than the factory system and roughly 13 dB more sound than stock.
Fitment
- Honda Civic Type R FL5, 2023 and newer (K20C engine)
- Not for the FK8 Civic Type R or non-Type R Civics
Specifications
- Manufacturer part number: 31006-KH001
- Design: valveless, full straight-through (HKS "Hi-Power" type), bullet-shaped main silencer
- Piping: 74.7mm center pipe splitting into dual 60.5mm pipes
- Tip: 119mm titanium with HKS logo
- Weight: 26.5 kg (system)
- Minimum ground clearance: 125mm on stock suspension (lowered cars will be lower)
Performance and sound (HKS in-house testing)
- Exhaust back pressure about 30% lower than stock
- Up to +3.6 kW (about +4.8 hp) between 5,000 and 6,000 rpm, and up to +7.5 Nm torque around 3,000 rpm
- Idle sound: 93 vs 80 on the stock system. Overall about 13 dB louder than stock and about 9 dB louder than the HKS Legamax Sports
- On a stock ECU, peak output is limited to stock levels because the factory ECU manages torque. A tune unlocks more of the gain.
What's in the box
- Complete cat-back exhaust
- Dedicated actuator that works with the factory exhaust valve motor to avoid fault codes
Good to know
If the factory valve motor is removed or disconnected, the car stores a fault code (the check engine light does not come on). This exhaust is significantly louder than stock, so check your local noise laws before buying.
FAQ
Is the HKS Hi-Power louder than the stock FL5 exhaust?
Yes. HKS measures it about 13 dB louder overall than the factory exhaust.
Does it need a tune?
No, it bolts on and runs on the stock ECU. A tune is needed to see peak power gains, because the factory ECU limits torque.
Will it set a check engine light?
Not when installed with the included actuator and the factory valve motor connected.
How long does shipping take?
Delivery times vary by part because many items ship directly from the manufacturer or distributor. Message us before ordering and we'll confirm current lead time.
Can I return it?
Yes. Returns are accepted within 30 days of delivery. The customer pays return shipping, and a restocking fee of up to 20% may apply.
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