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The K24A2 in your 2004–2008 Acura TSX is one of Honda's finest four-cylinders — 200 horsepower, i-VTEC on both intake and exhaust cams, and a willingness to rev that puts most modern engines to shame. But from the factory, it breathes through a plastic airbox filled with resonator chambers and a restrictive panel filter designed to keep things quiet. The engine is capable of more — it just needs the air to get there.
Flashark's cold air intake kit replaces the entire factory intake assembly with a Φ76mm (3-inch) mandrel-bent aluminum pipe flowing into a high-flow dry cone filter. The pipe features dual integrated breather nozzles to retain the factory PCV and vacuum line connections exactly as Acura designed them — no check engine light, no deleted emissions plumbing. A Φ76→Φ70mm reducer coupler ensures a tight, leak-free fit at the throttle body. The result is sharper throttle tip-in, stronger mid-range pull where the K24 does its best work, and that unmistakable i-VTEC induction roar when the second cam lobe kicks in.
Installation is genuinely bolt-on: the integrated bracket lines up with factory mounting holes, all hardware is included down to the anti-vibration mount, and the job takes 45–75 minutes with basic hand tools. The dry filter requires no oiling — periodic cleaning with compressed air keeps it flowing for years. This isn't a universal kit with adapters and zip ties. It's purpose-built for the TSX.
Key Features
Φ76mm (3-inch) mandrel-bent aluminum intake pipe — Single-piece construction with matte black powder-coated finish; smooth internal bends maintain airflow velocity from filter to throttle body
K24A2-specific breather design — Dual integrated nozzles on the intake pipe retain factory PCV and vacuum line connections exactly as designed; no deleted emissions plumbing, no CEL
Φ76→Φ70mm reducer silicone coupler — Heat-resistant airtight coupler ensures exact fitment at the throttle body connection; no universal slip-fit slop
High-flow red dry cone filter — 120mm top / 155mm base / 132mm height, Φ76mm inlet; dry cotton gauze media requires no oil — oil-free means zero MAF sensor contamination risk
Integrated mounting bracket — Lines up with factory mounting points for true bolt-on installation; includes anti-vibration mount to isolate intake from engine movement
5–10 WHP on K24A2 — Honest gains for a 200hp engine with a well-designed factory intake; the improvement you feel is sharper throttle response, not just a dyno number
i-VTEC induction sound — Unlocks the K24's signature intake growl, especially above 4,500 RPM when VTEC engages; aggressive under load, refined at cruise
Complete hardware kit included — 1× filter clamp, 2× narrow band clamps (65-89mm and 59-82mm), 1× anti-vibration mount with M6 threads, washer, M6 lock nut, vacuum hose adapter
45–75 minute DIY install — Bolt-on with basic hand tools (socket set, screwdrivers); no cutting, no drilling, no permanent modifications
| 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).
Q: Will this fit my 2004-2008 Acura TSX?
A: Yes. This intake is specifically designed for 2004–2008 Acura TSX models with the 2.4L K24A2 DOHC i-VTEC engine. It fits both automatic- and manual-transmission vehicles and bolts directly to factory mounting points. Not compatible with 2009+ TSX (CU2 chassis) or TSX V6.
Q: Will this fit a 2004-2008 Honda Accord 2.4L?
A: 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 chassis). The TSX is built on the European/Japanese Accord platform with a different front subframe and engine bay packaging. This intake is TSX-specific.
Q: Will this fit the 2009-2014 TSX?
A: No. The 2009–2014 TSX (CU2 chassis) is a completely different vehicle, with redesigned engine-bay packaging, airbox location, and intake routing — even though it shares the K24 nameplate. This intake is only compatible with the 2004–2008 CL9-chassis TSX.
Q: Is this a true cold air intake or a short ram?
A: This is a short ram intake with an integrated heat shield — not a true cold air intake that routes the filter into the fender well. The filter sits in the engine bay behind the heat shield, which blocks direct radiant heat from the exhaust manifold. Compared to a true CAI, this design is easier to install, safer in the rain, and requires no cutting. The trade-off is slightly higher intake air temps at idle — which return to near-ambient once you're moving.
Q: How much horsepower does this intake add on a K24A2?
A: Realistic gains on a stock K24A2 are 5–10 WHP. The TSX's factory intake is actually well-designed for a production car — the restrictions are the panel filter and resonator chambers, not the piping diameter. The gains you feel are improved throttle response, stronger mid-range pull (3,000–5,000 RPM), and the engine's willingness to rev more freely. Gains increase if paired with a header, exhaust, and tune — but intake alone makes the car more responsive and more fun.
Q: Do I need a tune after installing this intake?
A: No tune is required for basic bolt-on installation. The factory ECU's closed-loop fuel trim on the K24A2 can adapt to the modest increase in airflow within safe parameters. The MAF sensor housing diameter matches stock spec, so air-fuel ratios stay within the ECU's learning range. If you later add a header, larger throttle body, or other significant airflow mods, a tune (Hondata/KTuner) is recommended to maximize gains.
Q: Will this intake trigger a check engine light?
A: A properly installed intake should not trigger a CEL. The dual breather nozzles retain the factory PCV and vacuum connections, and the MAF housing diameter matches stock spec. Most CEL issues after intake installation come from: (1) MAF sensor installed backward or not fully seated, (2) vacuum line left disconnected during the swap, or (3) loose coupler clamps causing unmetered air leaks (P0171 lean code). Double-check all connections before starting.
Q: Will this intake make my TSX louder?
A: Yes — and that's 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'll hear a deeper, more aggressive induction tone. When VTEC engages at 4,500 RPM, the sound shifts from a smooth hum to a sharper growl, which the factory airbox completely muffles. It transforms the driving experience without being obnoxious.
Q: How do I clean the filter?
A: This is a dry filter — no oil or cleaning kit required. Remove the filter from the pipe, tap out loose debris, and blow compressed air from the inside out (never outside-in — that forces dirt deeper into the media). For heavier buildup, rinse with warm water and let air-dry completely before reinstalling. Clean every 15,000–20,000 miles or when visibly dirty. The dry media means no MAF sensor contamination from filter oil.
Q: Is this intake safe for daily driving in rain?
A: Yes. The filter is positioned behind the heat shield in the engine bay, not in the fender well — so it's 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.
Q: Does this intake improve fuel economy?
A: Possibly, but it's not guaranteed and not the reason to buy this intake. Some drivers see slight MPG improvements under steady highway cruising due to reduced pumping losses. In practice, the improved throttle response and intake sound tend to encourage more aggressive driving, which negates any efficiency gain. Your driving habits, tire pressure, and spark plug condition have a greater impact on TSX fuel economy than the intake does.
Q: How difficult is installation on a scale of 1–10?
A: About a 3 out of 10. You'll need a 10mm and 12mm 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 (this is the most annoying part — it's tucked 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 breather lines, install the filter, and clamp everything tight. Budget 45–75 minutes for a first-timer, less if you've done intake work before.
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