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The factory intake on the 2007–2012 Nissan Altima 2.5L was designed for a very specific goal: silence. Between the resonator chambers, baffled airbox, and restrictive panel filter, the QR25DE engine is breathing through a maze before air ever reaches the throttle body. It works fine for commuting — but if you've ever felt the throttle lag when merging onto the highway, you know the stock system leaves power on the table.
Flashark's cold air intake kit replaces the entire factory airbox assembly with a smooth, mandrel-bent aluminum intake tube and a high-flow dry cone filter. The result is a noticeably sharper throttle response from a stop, faster mid-range pickup, and an intake tone that finally lets the 2.5L four-cylinder be heard. On an otherwise stock QR25DE, realistic gains are 3–7 WHP with improved driveability — the kind of difference you feel every time you press the gas, not just on a dyno sheet.
Installation is bolt-on, with no cutting, no permanent modifications, and no special tools required. The included heat shield keeps the filter out of direct engine bay heat, and the dry filter requires no oiling — just periodic cleaning with compressed air. It's a practical, honest upgrade for the daily-driven Altima that delivers better response and sound in a car you already drive every day.
Key Features
QR25DE-specific design – Engineered for the 2.5L inline-4 engine (QR25DE) in 2007–2012 Nissan Altima (L32 generation); not compatible with 3.5L V6 (VQ35DE) models
Mandrel-bent aluminum intake tube – Black powder-coated finish resists corrosion and engine bay heat; smooth internal bends maintain consistent airflow velocity
High-flow dry cone filter – Oil-free design eliminates MAF sensor contamination risk; red filter element is washable and reusable with compressed air — no oiling kit needed
Heat shield included – Shields the filter from direct radiant engine heat; helps maintain cooler intake air temperatures compared to an open-element setup
3–7 WHP on stock QR25DE – Honest gains on an otherwise stock engine; throttle response improvement is the real upgrade, especially from a stop and at part-throttle
Bolt-on, no fabrication – Reuses factory mounting points; all couplers, clamps, and hardware included — no cutting, no drilling, no permanent changes
Inline-4 induction sound – Unlocks a deeper, more aggressive intake note under acceleration without being intrusive at cruise
45–75 minute DIY install – Straightforward job with basic hand tools (socket set, screwdrivers); suitable for first-time installers
Specifications
Brand: Flashark
SKU: FLIS25132
Type: Cold Air Intake Kit
Pipe Material: Aluminum
Pipe Finish: Black powder-coated
Filter Type: Dry (oil-free, reusable)
Filter Color: Red
Heat Shield: Included
Intake Diameter: 3.0 inch (76mm)
Installation: Bolt-on, no cutting or permanent modifications required
Package Includes
1x Black powder-coated aluminum mandrel-bent intake tube
1x High-flow dry cone air filter (red)
1x Heat shield assembly with mounting bracket
1x Set of silicone couplers
1x Set of stainless steel hose clamps
1x Set of mounting hardware (bolts, nuts, washers)
1x Installation guide
| Years | Make | Model | Engine |
|---|---|---|---|
| 2007 | Nissan | Altima | 2.5L I4 QR25DE |
| 2008 | Nissan | Altima | 2.5L I4 QR25DE |
| 2009 | Nissan | Altima | 2.5L I4 QR25DE |
| 2010 | Nissan | Altima | 2.5L I4 QR25DE |
| 2011 | Nissan | Altima | 2.5L I4 QR25DE |
| 2012 | Nissan | Altima | 2.5L I4 QR25DE |
Q: Will this fit my 2007-2012 Nissan Altima 2.5L?
A: Yes. This intake is designed for 2007–2012 Nissan Altima models with the 2.5L QR25DE inline-4 engine. It is a direct bolt-on replacement for the factory airbox. Always verify your engine — pop the hood and check the engine cover or VIN (4th character "C" = QR25DE, "V" = VQ35DE V6).
Q: Will this fit a 3.5L V6 Altima?
A: No. The 3.5L VQ35DE V6 engine uses a completely different intake layout, MAF sensor housing, and airbox design. This intake is specifically engineered for the 2.5L QR25DE four-cylinder. Using it on a V6 will not work and may trigger a CEL.
Q: Will this fit the Altima Coupe?
A: Not guaranteed. While the Altima Coupe (2008–2013) shares the same QR25DE engine, the engine bay packaging, airbox mounting points, and hood clearance can differ from the Sedan. If you have a Coupe, verify intake routing and clearance before ordering.
Q: How much horsepower does this intake add on a QR25DE?
A: Realistic gains on a stock QR25DE are 3–7 WHP. The QR25DE is a 175hp economy engine, not a high-strung performance motor — intake gains are modest. The improvement you'll actually feel is sharper throttle tip-in, smoother mid-range pull, and less hesitation when merging or passing. If you're chasing maximum numbers, you'll need exhaust + header + tune — but intake alone makes the car more responsive and more fun to drive.
Q: Do I need a tune after installing this intake?
A: No tune is required. The factory ECU's closed-loop fuel trim can compensate for the modest increase in airflow. The MAF sensor remains in the same position relative to the intake tube diameter, so air-fuel ratios stay within safe limits. If you later add headers, a larger throttle body, or other significant airflow mods, a tune is recommended.
Q: Will this intake trigger a check engine light?
A: A properly installed intake should not trigger a CEL. Most issues come from: (1) MAF sensor installed backward or not fully seated, (2) loose hose clamps causing unmetered air leaks (P0171 lean code), or (3) vacuum line left disconnected during the airbox removal. Double-check all connections before starting the engine.
Q: Does this intake improve fuel economy?
A: Possibly, but don't count on it. The main factors affecting Altima 2.5L fuel economy are your driving habits, tire pressure, spark plug condition, and CVT fluid health — not the intake. If you drive the same way after installing, MPG should stay roughly the same. If you're constantly on the throttle to hear the new intake sound, expect it to go down.
Q: Will this intake make my Altima louder?
A: Yes — that's one of the main reasons people buy it. At idle and steady highway cruise, the intake is barely louder than stock. Under acceleration, especially above 3,000 RPM, you'll hear a deeper, more aggressive induction growl from the engine bay. It's not obnoxious or droning — think of it as finally letting the QR25DE breathe audibly instead of being muffled by the factory resonator maze.
Q: Is this intake safe for daily driving in all weather?
A: Yes. The heat shield protects the filter from engine bay heat and splashing. For normal rain, puddles, and everyday conditions, the intake is perfectly safe. The one exception: avoid driving through standing water deep enough to submerge the lower bumper area, as the cone filter sits lower than the factory sealed airbox. This applies to any open-element intake.
Q: How do I clean the filter?
A: This is a dry filter — no oil or cleaning kit required. Remove the filter, tap out loose debris, and blow compressed air from the inside out (never from the outside in — that forces dirt deeper into the media). For heavy buildup, rinse with warm water, let it air-dry completely, and reinstall. Clean every 15,000–20,000 miles or when visibly dirty.
Q: Does this intake affect the QR25DE's known oil consumption issue?
A: No. The QR25DE's oil consumption on some 2007–2010 models is caused by piston-ring and PCV-system design and is unrelated to the intake. Installing a cold air intake does not improve or worsen oil consumption. If your Altima burns oil, address the root cause (PCV valve replacement, ring inspection) separately from intake modifications.
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, a Phillips screwdriver, and a flathead screwdriver. The main steps: disconnect the MAF sensor, remove the factory airbox and resonator, bolt in the heat shield, connect the new intake tube and couplers, reinstall the MAF sensor, and attach the filter. Budget 45–75 minutes if it's your first time. The resonator tucked in the fender well is the most annoying part to remove.
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