Product Specifications
2002–2005 Honda Civic Si EM2 Cold Air Intake (K20A2 / K20A3)
This Flashark Cold Air Intake is engineered for the 2002–2005 Honda Civic Si EM2 (K20A2 / K20A3) and replaces the factory airbox and intake tube with a 3.0" mandrel-bent aluminum tube routed to an inner-fender cold-air feed. The sealed heat-shielded inlet keeps intake charge cooler than the stock airbox, while the included dry, reusable filter preserves factory MAF calibration without a tune. A typical home installer can finish the bolt-on swap in about 90 minutes with basic hand tools.
Specifications
| Spec | Detail |
|---|---|
| Brand | Flashark |
| System Type | Cold Air Intake (CAI) |
| Material | 6061-T6 aluminum (intake tube) |
| Tube Diameter | 76mm (3.0") |
| Filter Type | Dry, washable, reusable (no oil required) |
| Filter Size | 4.5" conical with velocity stack |
| MAF Housing | CNC-machined 76mm, factory MAF location retained |
| Intake Temp Reduction | Approximately 15–25°F vs. stock (factory airbox baseline) |
| Tune Required | No — plug-and-play with factory K20 ECU |
| Install Time | Approximately 90 minutes (hand tools) |
| Warranty | 1 Year |
Key Features
- 3.0" mandrel-bent 6061-T6 aluminum tube: Smooth interior with no step-downs, matched to the K20A2 / K20A3 throttle body bore for steady airflow through the EM2 engine bay.
- 4.5" conical dry filter with integrated velocity stack: Washable, reusable, no oil required — won't foul the MAF sensor and keeps filter maintenance simple across high-RPM driving.
- Inner-fender cold-air routing: Heat shield behind the inner liner pulls ambient air from outside the bay instead of engine-bay heat, so intake charge runs cooler than the stock airbox.
- CNC-machined 76mm MAF housing: Designed to retain the factory MAF sensor location and bore so the K20A2 (2004–2005) and K20A3 (2002–2003) ECU calibration stays within the OEM envelope.
- No tune required: Works with the stock K20 ECU and remains compatible with Hondata / K-Pro if the car is already tuned.
- Bolt-on installation: OEM-spec mounting points; about 90 minutes with basic hand tools.
Who this kit is for
This Flashark Cold Air Intake fits the 2002–2005 Honda Civic Si EM2 with the 2.0L K20A2 / K20A3 engine.
✓ For you if… you drive an EM2 Civic Si and want a sealed cold-air box that pulls from outside the bay · you prefer a washable dry filter over disposable paper elements · you want a first bolt-on K-series upgrade that doesn't require a tune · you want a 90-minute install with hand tools · you've confirmed your county / state emissions rules in the Compliance section below.
✗ Not for you if… your Civic is a 2001 D17, a 2001–2005 LX / EX / DX / HX, or a 2006–2011 EP3 / FG2 / 2012–2015 FB6 Si (different chassis and engine) · you've done a K-swap into an EG / EK / DC2 / EP3 and need a swap adapter (not included) · you need an OEM-replacement airbox or factory paper element · you're in a CARB-adopting state and this SKU carries no EO (see Compliance section) · you regularly ford deep water without a filter relocation (see hydrolock note in Check Before Ordering).
Check before ordering
- Vehicle match: Exact-fit for the 2002–2005 Honda Civic Si EM2 with the 2.0L K20A2 (2004–2005) or K20A3 (2002–2003). Does NOT fit: the 2001 Civic D17, any 2001–2005 Civic LX / EX / DX / HX (different engine and chassis), the 2006–2011 Civic Si EP3 / FG2, or the 2012–2015 Civic Si FB6 (K24Z7). K-swap installs into EG / EK / DC2 / EP3 require a swap adapter that is not included — message us before ordering.
- Intake type: Sealed heat-shielded box with an inner-fender inlet — a true cold-air intake, not a short-ram.
- Filter care: Dry filter, no oil required; clean and reuse per the kit instructions. No re-oiling step, so there's no risk of over-oiling the MAF.
- Sensors & throttle body: Designed to retain the factory MAF sensor location and 76mm bore, matched to the stock K20 throttle body. No spacer or adapter is required for the listed applications.
- Legality: This SKU does not carry a CARB Executive Order. See the Compliance section below for the state-by-state rule before you order.
- Install & water exposure: Bolt-on with OEM-spec mounting points, about 90 minutes, basic hand tools. The filter sits low in the inner-fender area — avoid deep water crossings; water ingestion can cause hydrolock and severe engine damage.
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What's in the box
- 1× 76mm (3.0") mandrel-bent 6061-T6 aluminum intake tube
- 1× 4.5" dry conical air filter with velocity stack (washable and reusable)
- 1× Inner-fender heat shield / airbox
- 1× CNC-machined 76mm MAF sensor housing
- 1× Multi-layer silicone coupler with stainless T-bolt clamps
- 1× Installation hardware kit
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.
