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2002–2011 Honda Civic Si 2.0L Cold Air Intake Kit (K-series)
This Flashark cold-air intake kit replaces the factory airbox and intake tube on 2002–2011 Honda Civic Si models equipped with the 2.0L K-series engine — covering the 7th-gen K20A3 (2002–2005 Si) and the 8th-gen K20Z3 (2006–2011 Si) on both the FG2 coupe and FA5 sedan. It’s engineered as a direct bolt-on upgrade: mandrel-bent aluminum intake tube, a washable high-flow filter, silicone coupler and clamps — all sized to reuse the factory MAF sensor location and bore so no spacer or adapter is required. Whether you’re shopping for an 05 Honda Civic cold air intake for daily spirited driving or a 2008–2011 Si build, the kit is designed to draw cooler, denser air through a shorter, smoother path than the stock airbox while keeping the factory sensor calibration inside the OEM envelope.
Typical intake-only gains depend on your build, but you can expect approximately +5 to +10 hp and about 6–8% more torque on a stock K20Z3 Si, with the strongest gains feeling most noticeable in throttle response and upper-RPM airflow. Filtration efficiency is rated up to about 95% with the included Micro Cotton Gauze filter, which is washable with water or mild soap and reusable across the life of the kit.
Specifications
| Brand | Flashark |
|---|---|
| Product Type | Cold Air Intake Kit (listed as Cold Air Intake) |
| Vehicle Compatibility | 2002–2011 Honda Civic Si 2.0L (K20A3 / K20Z3) |
| Material | Mandrel-bent aluminum intake tube, powder-coated black |
| Filter | Reusable high-flow filter — Micro Cotton Gauze, washable with water or mild soap |
| Included Hardware | 1× performance cold-air intake (tube + filter + silicone coupler + clamps + mounting hardware + instructions) |
| Sensor Compatibility | Retains factory MAF sensor location and bore — no spacer or adapter required |
| Estimated Install Time | Under 60 minutes with common hand tools |
| Variants | 2002–2005 (SKU FLIS25060) / 2006–2011 (SKU FLIS25055) |
Key Features
- Direct-fit for K-series Civic Si: Built for the 2.0L K20A3 (2002–2005 Si) and K20Z3 (2006–2011 Si) — reuses the factory MAF sensor location and bore, so no spacer, adapter, or recalibration is required for a basic bolt-on install.
- Mandrel-bent aluminum intake tube: Powder-coated black aluminum piping replaces the restrictive factory airbox and accordion tube, smoothing airflow into the throttle body for improved throttle response and stronger high-RPM breathing on a stock or lightly modified Si.
- Reusable Micro Cotton Gauze filter: The included washable high-flow filter is rated at approximately 95% filtration efficiency and is reusable across the life of the kit — clean with water or mild soap and re-oil per the included instructions.
- Expected output range: Typical intake-only gains for a stock K20Z3 Civic Si are approximately +5–10 hp and around 6–8% more torque; actual results depend on supporting modifications, ECU calibration, and install quality.
- Sporty induction sound: The high-flow filter and smoother intake path deliver a more aggressive, sporty induction tone — strongest during VTEC engagement and upper-RPM acceleration — without the drone of an open-header setup.
- Bolt-on in under 60 minutes: Installs with common hand tools using the included mounting hardware, silicone coupler, and clamps; no drilling, no permanent modification to the engine bay.
- Daily-drivable design: Engineered to keep factory sensor calibration inside the OEM envelope when installed correctly — see the Check Before Ordering checklist and FAQ for CEL prevention guidance.
Who This Kit Is For
This kit is for owners of 2002–2011 Honda Civic Si 2.0L (K20A3 / K20Z3) — hatchback, coupe or sedan — looking for a direct bolt-on intake upgrade.
✓ For you if… you want a deeper intake tone under acceleration and stronger throttle response · you’re searching for an 05 Honda Civic cold air intake or a 2006–2011 K20Z3 Si upgrade and want a bolt-on that retains factory sensors · you prefer a reusable Micro Cotton Gauze filter over disposable paper elements · you do light mods (intake + cat-back or header) and want consistent gains without retuning · you’ve confirmed your engine code matches the fitment table above.
✗ Not for you if… your Civic is a non-Si trim (LX / EX / DX / HF) with the 1.8L R18 engine · you drive a 10th-generation (FC/FK) Civic or a Civic Type R (FK2/FK8) · you need a 50-state CARB-legal intake (see Compliance Notice below) · you expect a guaranteed fuel-economy number · you plan deep water crossings without a high-mount or relocation setup.
Check Before Ordering
- Vehicle match: Confirm year, body style (EP3 hatchback / FG2 coupe / FA5 sedan), and engine code (K20A3 for 2002–2005 Si; K20Z3 for 2006–2011 Si). This kit is not for 1.8L R18 non-Si trims, 10th-gen (FC/FK) Civic, or Civic Type R.
- Intake type: This kit is listed as a Cold Air Intake and replaces the factory airbox and intake tube with a mandrel-bent aluminum tube and high-flow reusable filter.
- Filter care: The Micro Cotton Gauze filter is washable and reusable — clean with water or mild soap, allow to dry, and re-oil per the included instructions. Over-oiling can coat the MAF sensor and trigger a CEL.
- Sensor & throttle body: The kit retains the factory MAF sensor location and bore — no spacer or adapter is required. For stock throttle-body applications, no tune is needed for a basic bolt-on install.
- Street legality: This SKU does not carry a CARB Executive Order (EO) number. See the Compliance Notice below before ordering in California or other CARB-adopting states.
- Install environment: Bolt-on install is typically under 60 minutes with common hand tools. Avoid deep water crossings — like most open-element intakes, water reaching the filter can cause hydrolock and severe engine damage.
What’s in the Box
- ✓ 1× mandrel-bent black powder-coated aluminum intake tube
- ✓ 1× reusable high-flow Micro Cotton Gauze cone filter
- ✓ 1× silicone coupler / elbow adapter
- ✓ Stainless steel hose clamps and trim tubing
- ✓ Mounting bracket, bolts, washers, and hex key
- ✓ Sensor adapter (reuses the factory MAF sensor — sensor itself is not included)
- ✓ Installation instructions
Looking for a replacement filter or cleaning kit for this intake? See Honda Air Intake Kits for related replacement and maintenance parts.
Shipping & Returns
Free U.S. Shipping: Orders are typically processed within 1–2 business days and delivered within 7–9 business days. Additional charges may apply to remote areas.
30-Day Returns: Unopened and unused items in their original packaging may be returned within 30 days of receipt. Return shipping is covered for verified quality issues.
Worry-Free Delivery: Optional protection against eligible loss, theft, delay, or transit damage is available at checkout.
Fitment
| Year | Model | Engine | Body Style | Drivetrain |
|---|---|---|---|---|
| 2002-2005 | Honda Civic Si (EP3) | 2.0L K20A3 DOHC i-VTEC | Hatchback | FWD |
| 2006-2011 | Honda Civic Si (FG2 Coupe / FA5 Sedan) | 2.0L K20Z3 DOHC i-VTEC | Coupe / Sedan | FWD |
Not for non-Si trims: this kit is not compatible with 1.8L R18 Civic LX / EX / DX models, 10th generation (FC/FK) chassis, or the Civic Type R (FK2/FK8). Confirm your engine code and trim before ordering.
2002–2011 Honda Civic Si 2.0L Cold Air Intake FAQs
Q1: Is this cold air intake legal in my state?
A1: Not legal for sale or use in California (and other CARB-adopting states). This SKU does not carry a CARB EO number and is intended for off-road / racing use and for use in non-CARB states. Confirm your state and local emissions rules before installing on a road-driven vehicle.
Q2: Will this fit my 2006–2011 Honda Civic Si?
A2: Yes. The kit is built for 2006, 2007, 2008, 2009, 2010, and 2011 Honda Civic Si models with the 2.0L K20Z3 DOHC i-VTEC engine — both the FG2 coupe and FA5 sedan. It is not compatible with 1.8L R18 non-Si trims, the 10th-generation (FC/FK) Civic, or the Civic Type R (FK2/FK8).
Q3: Will it also fit a 2002–2005 Civic Si?
A3: Yes — the same kit covers the 2002–2005 EP3 Civic Si hatchback with the 2.0L K20A3 engine. Select the matching year option at checkout to get the correct bracket and tube length for your chassis.
Q4: How much horsepower will this add on a K20Z3 Si?
A4: Typical intake-only gains for a stock K20Z3 Civic Si are approximately +5–10 hp and around 6–8% more torque. Actual results depend on supporting modifications (cat-back, headers, throttle body), ECU calibration, and installation quality.
Q5: Will this intake throw a check engine light (CEL)?
A5: A properly installed intake that retains the factory MAF sensor location and bore should not throw a CEL. CELs are usually the result of an intake leak, an over-oiled filter, or a mismatched sensor bore — our install checklist covers how to avoid each.
Q6: Do I need a tune after installing this intake?
A6: No tune is required for a basic bolt-on install that retains the factory MAF sensor and stock throttle body. A custom tune is recommended only when combined with other modifications such as headers, a full exhaust, or an upgraded throttle body.
Q7: What is the difference between a cold air intake and a short ram intake on a Civic Si?
A7: A cold air intake (this kit) is listed as a sealed-box / cold-side design that draws air from outside the engine bay for cooler intake charge. A short ram intake places the filter closer to the throttle body for a louder, more immediate induction sound but pulls warmer air from inside the bay. If maximum sound and simplest install are your priority, consider a short ram instead.
Q8: Will this improve VTEC performance on the K20Z3?
A8: Indirectly — the K20Z3’s VTEC engagement benefits from improved airflow at higher RPM, and the smoother intake path and reusable high-flow element help the engine breathe more consistently in the upper rev range.
Q9: How difficult is the installation?
A9: Installation is moderate and typically takes under 60 minutes using common hand tools. It involves removing the factory airbox and accordion tube, mounting the new aluminum intake tube and bracket, and securing the silicone coupler and clamps. No drilling or permanent modification is required.
Q10: What does this intake sound like?
A10: You’ll hear a deeper, more aggressive intake tone under acceleration — strongest during VTEC engagement and upper-RPM pull. At cruise the cabin stays quiet. Sound is subjective; if you want the loudest possible option, choose an open-element (short ram) style instead.
Q11: Is this intake safe in rain or deep water?
A11: Normal rain driving is fine. Avoid deep water crossings; water ingestion can cause hydrolock and severe engine damage. If you regularly ford water, consider a high-mounted or relocation setup.
Q12: Will this void my factory warranty?
A12: Under the Magnuson-Moss Warranty Act, an aftermarket part cannot void your factory warranty unless the manufacturer proves it caused the issue. This kit is designed as a direct bolt-on replacement that keeps the factory MAF sensor location, bore, and connectors.
Shopping for a similar kit or replacement parts? See Honda Civic Cold Air Intake Kits for compatible options across Civic generations.
Fast Shipping Policy
Your order will be dispatched within 1-2 business days, and the package will arrive within your order's estimated date. Click for Shipping Policy
Easy Return Policy
Every order comes with a 30-day free return, provided the item is brand new, uninstalled, and in its original packaging. We cover return shipping for quality issues. Refunds are processed within 3-5 business days. Click for Return Policy
Worry-Free Delivery Protection
Add Worry-Free Delivery at checkout — if it's lost, stolen, or damaged, you're 100% covered. Click for Worry-Free Delivery Protection