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Acura TSX Cold Air Intake 2004-2008 2.4L K24A2 | Flashark
Built for the 2004-2008 Acura TSX 2.4L K24A2 (CL9). Replaces the sealed factory airbox with a 76 mm mandrel-bent aluminum tube feeding a high-flow red dry cone filter behind an integrated heat shield. Sharper throttle tip-in, a more audible i-VTEC note above 4,500 RPM, and 5–10 WHP on a stock K24A2. Genuine 45–75 minute bolt-on with all hardware included.
Specifications
| Brand | Flashark |
| Product Type | Open-element short ram intake with integrated heat shield (engine-bay mounted filter) |
| Intake Tube Diameter | 76 mm (3 in) mandrel-bent aluminum, single-piece construction |
| Tube Finish | Matte black powder-coated aluminum |
| Throttle-Body Coupler | 76 → 70 mm heat-resistant silicone reducer coupler |
| Air Filter Type | High-flow red dry cotton gauze cone filter (no oiling required) |
| Filter Dimensions | 120 mm top / 155 mm base / 132 mm height, 76 mm inlet |
| Heat Shield | Integrated heat shield blocks direct radiant heat from the exhaust manifold |
| Breather Ports | Dual integrated breather nozzles (retains factory PCV + vacuum line connections) |
| MAF Sensor Compatibility | Retains factory MAF sensor at the OEM location and bore |
| Mounting | Integrated bracket aligned to factory mounting points; M6 anti-vibration mount included |
| Hardware Included | 1× filter clamp · 2× narrow band clamps (65–89 mm and 59–82 mm) · 1× M6 anti-vibration mount · washer · M6 lock nut · vacuum hose adapter |
| Installation Time | 45–75 minutes |
| Tools Required | 10 mm and 12 mm sockets · Phillips and flathead screwdrivers · trim removal tool (optional) |
| Filter Cleaning Interval | Every 15,000–20,000 miles or when visibly dirty; clean more often in dusty environments |
| Expected Output Range | Approximately +5–10 WHP on a stock K24A2; results vary with vehicle state, calibration, and supporting hardware |
| Tune Required | No tune required for basic bolt-on install (MAF bore matches OEM spec) |
| SKU | FLIS25045 |
Key Features
- 76 mm (3 in) mandrel-bent aluminum intake pipe: Single-piece construction with a matte black powder-coated finish; smooth internal bends keep airflow velocity consistent from the filter to the throttle body.
- K24A2-specific breather design: Dual integrated nozzles on the intake pipe retain the factory PCV and vacuum-line connections exactly as Acura designed them, so emissions plumbing stays intact and the MAF housing bore matches OEM spec.
- 76 → 70 mm heat-resistant silicone reducer coupler: A purpose-sized coupler that seals the throttle-body side without a universal-fit spacer or adapter gap.
- High-flow red dry cotton gauze cone filter: 120 mm top / 155 mm base / 132 mm height with a 76 mm inlet; the dry media requires no oil and avoids the over-oiling risk that can foul a MAF sensor.
- Integrated heat shield: Blocks radiant heat from the exhaust manifold at idle; once the car is moving, intake temperatures return to near-ambient.
- Integrated mounting bracket with M6 anti-vibration mount: Lines up with the factory mounting points for a true bolt-on install; the anti-vibration mount keeps the intake isolated from engine movement.
- Typical intake-only gains of approximately +5–10 WHP on a stock K24A2: The bigger real-world benefit is sharper throttle response and stronger mid-range pull between 3,000 and 5,000 RPM, where the K24A2 does its best work.
- Audible i-VTEC induction note: A deeper, more aggressive intake tone above 4,000 RPM, with a sharper character once VTEC engages at 4,500 RPM; refined and quiet at idle and steady cruise.
- Complete hardware kit + 45–75 minute bolt-on install: All clamps, brackets, vacuum hose adapter, and the M6 anti-vibration mount are in the box; install runs 45–75 minutes with basic hand tools and no drilling or cutting.
Who this kit is for
This Flashark cold air intake is built for owners of a 2004–2008 Acura TSX with the 2.4L K24A2 DOHC i-VTEC engine (1st generation, CL9 chassis, sedan, automatic or manual transmission). It's for drivers who want sharper throttle response, a more audible i-VTEC induction note, and a reusable dry filter, all installed in about an hour with basic hand tools.
For you if:
- You drive a 2004–2008 TSX 2.4L and want a first bolt-on upgrade that keeps the factory MAF and ECU strategy intact.
- You prefer a washable and reusable dry filter over disposable panel elements, with no filter oil to manage.
- You want a more audible i-VTEC induction note without going to a full straight-piped setup.
- You are not in California or another CARB-adopting state, or you are buying for off-road / track use only.
Not for you if:
- You have a 2009–2014 TSX (CU2 chassis), a TSX V6, or a 2004–2008 Honda Accord 2.4L — this kit is CL9-specific and does not bolt on to those vehicles.
- You expect a measurable MPG gain — an intake alone can't guarantee a fuel-economy improvement.
- You need a CARB EO-compliant street-legal intake for use on California public roads.
- You plan regular deep water crossings — this filter sits in the engine bay and is not designed for water ingestion.
Check before ordering
- Vehicle fitment: Exact fit for 2004–2008 Acura TSX 2.4L L4 DOHC K24A2 (CL9, sedan). Not compatible with the 2009–2014 TSX (CU2 chassis), the TSX V6 (J35), the 2004–2008 Honda Accord 2.4L (K24A4/A8), the Civic Si (K20Z3), the RSX (K20A2/Z1), or the TSX Wagon (2011–2014). If your vehicle isn't on the fitment table, message us before ordering.
- Intake type: This is an open-element short ram with an integrated heat shield — the filter sits in the engine bay, not in the fender well. If you want a true fender-fed sealed cold air intake, this kit is not the right design.
- Filter maintenance: Dry cotton gauze media — no oiling required. Clean every 15,000–20,000 miles (more often in dusty environments) by blowing compressed air from the inside out.
- Sensors and throttle body: The kit retains the factory MAF sensor at the OEM location and bore, and the reducer coupler is sized to the factory 70 mm throttle body. No MAF spacer, adapter, or tune is required for a basic install.
- Street legality: This kit does not carry a CARB Executive Order (EO). It is not legal for sale or use on pollution-controlled vehicles in California and other CARB-adopting states. See the Compliance Notice below.
- Install and water exposure: Bolt-on, 45–75 minutes with basic hand tools. The filter is mounted in the engine bay, not at fender height — normal rain is fine, but avoid deep water crossings where the water level could reach the filter.
What's in the box
- 1 × Intake pipe (76 mm mandrel-bent aluminum, with integrated bracket and dual breather nozzles)
- 1 × Red cone air filter (76 mm inlet, dry cotton gauze)
- 1 × Air filter clamp
- 2 × Narrow band clamps (65–89 mm and 59–82 mm)
- 1 × Heat-resistant silicone reducer coupler (76 → 70 mm)
- 1 × Single-head anti-vibration mount with M6 threads
- 1 × Washer
- 1 × M6 lock nut
- 1 × Vacuum hose adapter
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.
| Years | Make | Model | Engine |
|---|---|---|---|
| 2004 | Acura | TSX | 2.4L L4 DOHC K24A2 |
| 2005 | Acura | TSX | 2.4L L4 DOHC K24A2 |
| 2006 | Acura | TSX | 2.4L L4 DOHC K24A2 |
| 2007 | Acura | TSX | 2.4L L4 DOHC K24A2 |
| 2008 | Acura | TSX | 2.4L L4 DOHC K24A2 |
Not compatible with: 2009–2014 TSX (CU2 chassis — different engine bay layout and intake routing), TSX V6 (J35 V6 — completely different intake architecture), Honda Accord 2.4L (K24A4/K24A8 — similar engine but different intake layout), Honda Civic Si (K20Z3 — different engine and chassis), RSX (K20A2/Z1), TSX Wagon (2011-2014, different intake design).
2004-2008 Acura TSX 2.4L K24A2 Cold Air Intake FAQs
Q1: Will this fit my 2004-2008 Acura TSX?
A1: Yes. This kit is designed specifically for the 2004–2008 Acura TSX with the 2.4L K24A2 DOHC i-VTEC engine (CL9 chassis, sedan), and it fits both automatic- and manual-transmission vehicles. It bolts directly to factory mounting points. It is not compatible with the 2009–2014 TSX (CU2 chassis) or the TSX V6.
Q2: Will this fit a 2004-2008 Honda Accord 2.4L?
A2: No. While the Accord 2.4L (2003–2007) uses a K-series engine (K24A4/A8), the engine bay layout, airbox mounting points, and intake routing differ from the TSX (CL9). The TSX is built on the European/Japanese Accord platform, with a different front subframe and engine-bay packaging. This kit is TSX-specific.
Q3: Will this fit the 2009-2014 TSX?
A3: No. The 2009–2014 TSX (CU2 chassis) is a completely different vehicle, with a redesigned engine bay, airbox location, and intake routing — even though it shares the K24 nameplate. This kit is only compatible with the 2004–2008 CL9-chassis TSX.
Q4: Is this a true cold air intake or a short ram?
A4: This is a heat-shielded open-element short ram intake. The filter sits in the engine bay behind the integrated heat shield, not in the fender well. Compared with a true fender-fed cold air intake, this design is easier to install, safer in rain, and requires no cutting — the trade-off is slightly higher intake air temperatures at idle, which return to near-ambient once the car is moving. For an in-depth look at the design tradeoffs, see our short ram vs cold air intake comparison.
Q5: How much horsepower does this intake add on a K24A2?
A5: Typical intake-only gains on a stock K24A2 are approximately +5–10 WHP. The factory intake on the TSX is reasonably well-designed for a production car — the real restrictions are the panel filter and resonator chambers, not the piping diameter. What you feel is sharper throttle response, stronger mid-range pull between 3,000 and 5,000 RPM, and the engine's willingness to rev more freely. Gains increase if paired with a header, an exhaust, and a tune, but an intake alone makes the car more responsive and more engaging to drive.
Q6: Do I need a tune after installing this intake?
A6: No tune is required for a basic bolt-on install. The K24A2's factory ECU closed-loop fuel trim adapts to the modest airflow increase within safe parameters, and the MAF housing bore matches OEM spec, so air-fuel ratios stay inside the ECU's learning range. If you later add a header, a larger throttle body, or other significant airflow modifications, a tune (Hondata / KTuner) is recommended to maximize the gains.
Q7: Will this intake trigger a check engine light?
A7: This kit is designed to retain the factory MAF sensor location and bore, which keeps the MAF calibration inside the OEM envelope. A CEL after an intake install is almost always one of three things: a MAF sensor installed backward or not fully seated, a vacuum line left disconnected during the swap, or a loose coupler clamp causing an unmetered air leak (typically a P0171 lean code). Double-check every connection before the first start.
Q8: Will this intake make my TSX louder?
A8: Yes — and that is one of the main reasons TSX owners buy it. At idle and steady highway cruise the intake is barely louder than stock. Under acceleration, especially above 4,000 RPM, you will hear a deeper, more aggressive induction tone. When VTEC engages at 4,500 RPM, the note shifts from a smooth hum to a sharper growl, which the factory airbox completely muffles. It transforms the driving experience without becoming obnoxious.
Q9: How do I clean the filter?
A9: This is a dry filter, so no oil or cleaning kit is required. Remove the filter from the pipe, tap out loose debris, and blow compressed air from the inside out — never outside-in, which forces dirt deeper into the media. For heavier buildup, rinse with warm water and let it air-dry completely before reinstalling. Clean every 15,000–20,000 miles or when visibly dirty. Because the filter is dry, there is no filter oil to migrate onto the MAF sensor.
Q10: Is this intake safe for daily driving in rain?
A10: Yes. The filter is positioned behind the heat shield in the engine bay, not in the fender well, so it is less exposed to road spray than a true cold air intake. Normal rain and puddles are not a concern. As with any open-element intake, avoid driving through standing water deep enough to reach the filter level — water ingestion can cause hydrolock and severe engine damage.
Q11: Does this intake improve fuel economy?
A11: MPG is dominated by driving habits, and an intake alone can't guarantee a measurable fuel-economy gain. Some drivers see slight improvements under steady highway cruising thanks to reduced pumping losses; in practice, the sharper throttle response and intake note tend to encourage more aggressive driving, which offsets any efficiency gain. Your driving habits, tire pressure, and spark-plug condition have a larger impact on TSX fuel economy than the intake does.
Q12: How difficult is installation, and what about replacement parts?
A12: About a 3 out of 10. You will need a 10 mm and 12 mm socket, Phillips and flathead screwdrivers, and optionally a trim removal tool for the factory airbox clips. The main steps: disconnect the MAF sensor, remove the factory airbox and lower resonator (the most tedious part — it sits in the fender well), bolt the intake bracket to the factory mounting point, connect the reducer coupler to the throttle body, attach the pipe, reconnect the breather lines, install the filter, and clamp everything tight. Budget 45–75 minutes for a first-timer, less if you have done intake work before. For a step-by-step walkthrough, see our Acura TSX cold air intake install guide. When the dry cotton element reaches the end of its service life, swap it for a direct-fit replacement dry cone air filter for Acura TSX rather than re-using a clogged media.
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