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2001-2005 Lexus IS300 Cold Air Intake — 3.0L 2JZ-GE, Bolt-On Heat Shield Style
This Flashark cold air intake replaces the entire factory airbox on 2001-2005 Lexus IS300 (USDM) and Toyota Altezza (JDM) with a mandrel-bent aluminum intake tube and a high-flow dry cone filter, wrapped in a sealed heat shield that pulls air from outside the engine bay. Behind the factory intake maze sits the 2JZ-GE 3.0L inline-six — an engine built for more than the stock airbox lets it breathe. This kit unlocks that breathing room: a sharper throttle pedal, a deeper 2JZ induction growl, and a cooler, denser charge entering the combustion chamber on a stock or mildly built engine.
On a healthy 2JZ-GE, expect realistic 5-10 WHP and noticeably stronger mid-range pull — especially when paired with a free-flowing catback. The dry filter requires no oiling, so there is no MAF sensor contamination risk, and it can be cleaned with compressed air for years of service. Everything bolts directly onto the factory mounting points — no cutting, no welding, no permanent modifications, no tune required.
The heat shield keeps intake air cooler than an open-element setup on a hot day or in stop-and-go traffic. Whether you daily-drive the IS300 or maintain a weekend Altezza build, this kit is engineered as a direct bolt-on replacement that retains factory sensors and the factory throttle-body bore.
Specifications
| Brand | Flashark |
| SKU | FLIS25129 |
| Type | Cold Air Intake Kit (Heat Shield Style) |
| Pipe Material | Aluminum (mandrel-bent) |
| Pipe Finish | Black powder-coated |
| Filter Type | Dry (oil-free, reusable) |
| Filter Color | Red |
| Heat Shield | Included (sealed, outside-air pickup) |
| Intake Diameter | 3.0 inch (76 mm) |
| Sensor Compatibility | Retains factory MAF / IAT sensor at OEM location and bore |
| Install Time | 45-90 minutes (first-timer pace) |
| Tools Required | 10 mm and 12 mm sockets, Phillips and flathead screwdrivers, basic hand tools |
| Compliance | No CARB Executive Order issued for this SKU |
Key Features
2JZ-GE NA-specific design. Engineered for the naturally aspirated 3.0L 2JZ-GE inline-six in 2001-2005 Lexus IS300 (USDM) and Toyota Altezza (JDM); not designed for turbocharged 2JZ-GTE setups.
Mandrel-bent aluminum intake tube. Black powder-coated finish resists heat and corrosion; smooth internal bends maintain airflow velocity from filter to throttle body.
Reusable dry cone filter. Oil-free design eliminates MAF sensor contamination risk; clean with compressed air, no special oiling kit required.
Sealed heat shield included. Shields the filter from direct engine-bay heat and pulls air from outside the bay, helping maintain cooler intake air temperatures than an open-element setup.
Realistic 5-10 WHP on a stock 2JZ-GE. Actual gains depend on the vehicle, calibration, and supporting hardware; the typical benefit is sharper throttle response and stronger mid-range pull, with greater gains when paired with a free-flowing catback exhaust.
Bolt-on install, no fabrication, no tune required. Reuses factory mounting points; 45-90 minute DIY install with basic hand tools; retains factory MAF/IAT sensor location and factory throttle-body bore.
Who this is for
This kit is for owners of 2001-2005 Lexus IS300 (USDM) or Toyota Altezza (JDM) with the naturally aspirated 3.0L 2JZ-GE inline-six who want a bolt-on intake that sharpens throttle response, deepens the 2JZ induction sound, and uses a washable filter instead of disposable paper elements.
✓ For you if… you drive a stock or mildly built IS300 / Altezza and want a first bolt-on upgrade · you prefer a reusable dry filter over disposable ones · you want a deeper 2JZ induction tone under acceleration without an open-element drone at cruise · you've checked your state emissions rules below before ordering.
✗ Not for you if… you have a turbocharged 2JZ-GTE (different intake routing; see Check #1) · you drive a Lexus GS300 (chassis routing differs even with the same engine; see Check #1) · you expect a guaranteed MPG gain · you live in California or a CARB-adopting state and need an EO-stamped kit (see Compliance Notice).
Check before ordering
① Vehicle. Exact fit for 2001-2005 Lexus IS300 (USDM) and 2001-2005 Toyota Altezza (JDM) with the naturally aspirated 3.0L 2JZ-GE. Not designed for 2JZ-GTE, GS300, or IS200. If your YMM is not on the list, message us before ordering — don't guess.
② Intake style. This is a sealed cold air intake with a heat shield and outside-air pickup — a true CAI, not an open-element short ram.
③ Filter maintenance. Dry synthetic filter — no oil required. Clean every 15,000-20,000 miles or when visibly dirty by tapping loose debris and blowing compressed air from the inside out. For heavier buildup, rinse with warm water and let air-dry completely before reinstalling.
④ Sensors and throttle body. The kit retains the factory MAF / IAT sensor at the OEM location and bore, and is engineered for the factory 2JZ-GE throttle-body bore (76 mm intake diameter). If you run an aftermarket larger throttle body or oversized turbo inlet, verify coupler fitment with our support team before ordering.
⑤ Legality. This SKU does not carry a CARB Executive Order. It is not legal for sale or use in California and other CARB-adopting states. See the Compliance Notice section below for the full disclosure.
⑥ Install space and use case. Bolt-on, 45-90 minutes, basic hand tools. The cone filter sits lower than the factory-sealed airbox — fine for normal rain, but avoid deep standing water crossings (hydrolock risk). If you regularly ford water, consider a high-mounted filter relocation.
Browse the full Flashark air intake kits lineup if you want to compare by chassis or engine code before you order.
What's in the box
- 1 × Black powder-coated aluminum mandrel-bent intake tube
- 1 × High-flow dry cone air filter (red)
- 1 × Heat shield assembly with mounting bracket
- 1 × Set of silicone couplers
- 3 × Stainless steel hose clamps
- 1 × Mounting hardware kit (bolts, nuts, washers)
- 1 × Installation guide
The MAF / IAT sensor is reused from your factory airbox — it is not included in the kit and must be transferred during install. Replacement elements live in our Flashark replacement air filters lineup.
Shipping & Returns
Shipping. Orders ship from our U.S. warehouse within 1-2 business days. Standard ground shipping is free on orders over $99; smaller orders ship via UPS / USPS at checkout. Tracking is emailed as soon as the label is created. Most U.S. addresses receive their order within 3-7 business days after shipment.
Returns. Unused, uninstalled parts in original packaging can be returned within 30 days of delivery for a refund of the product price. Installed or used parts are not eligible for return due to the nature of aftermarket components. If your order arrives damaged or incorrect, contact us within 7 days of delivery and we will arrange a replacement or refund at our cost.
Warranty. Flashark covers this intake against manufacturing defects for one year from the date of purchase. Warranty does not cover damage from improper installation, off-road use, racing, or modification.
| Years | Make | Model | Engine |
|---|---|---|---|
| 2001–2005 | Lexus | IS300 | 3.0L L6 2JZ-GE (NA) |
| 2001–2005 | Toyota | Altezza | 3.0L L6 2JZ-GE (NA) |
Not compatible with: Turbocharged 2JZ-GTE engines, Lexus GS300 (chassis/intake routing differs), IS200 (1G-FE engine).
FAQ — Lexus IS300 Cold Air Intake
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 (FLIS25129) does not carry a CARB Executive Order. If you live outside California and the CARB-adopting states (such as Texas, Florida, Ohio, or most of the Southeast and Midwest), this kit is generally legal for street use on a 2001-2005 Lexus IS300 / Toyota Altezza, but emissions testing rules change frequently — confirm with your local DMV or emissions test station before installing.
Q2: Will this fit my Lexus IS300 or Toyota Altezza?
A2: This kit is an exact fit for the 2001-2005 Lexus IS300 (USDM) and 2001-2005 Toyota Altezza (JDM) equipped with the naturally aspirated 3.0L 2JZ-GE inline-six engine. It is not designed for the turbocharged 2JZ-GTE. It is not designed for the Lexus GS300 (chassis and intake routing differ, even though the GS300 shares the 2JZ-GE engine), and it is not designed for the Lexus IS200 (1G-FE engine, not 2JZ-GE). Always verify your engine code — 2JZ-GE, not 2JZ-GTE — before ordering.
Q3: How much horsepower will this add to my 2JZ-GE?
A3: Realistic intake-only gains on a stock naturally aspirated 2JZ-GE are approximately 5-10 WHP with improved mid-range torque. Gains scale higher when paired with a free-flowing catback exhaust or headers. Actual results depend on the specific vehicle, calibration, install quality, and supporting hardware — there is no single number that fits every build.
Q4: Will a cold air intake improve my MPG?
A4: MPG is dominated by driving habits, fuel quality, tire pressure, and vehicle condition. An intake alone cannot guarantee a measurable fuel-economy gain. The main benefits of this kit are sharper throttle response, a deeper intake tone, and cooler intake air under load — not a specific MPG figure.
Q5: Will installing this cold air intake void my factory warranty?
A5: Under the U.S. Magnuson-Moss Warranty Act, an aftermarket part cannot void your factory warranty unless the manufacturer proves the part caused the failure. This kit is engineered as a direct bolt-on replacement that retains the factory MAF / IAT sensor location, factory sensor bore, and factory throttle-body bore, so it operates within the OEM design envelope.
Q6: Will it throw a check engine light (CEL)?
A6: A properly installed Flashark cold air intake should not trigger a CEL on a healthy 2JZ-GE. Most CELs after an intake install are caused by an intake leak (loose clamps or unmetered air at the MAF flange), MAF sensor misalignment (not seated flush against the tube), or a damaged MAF sensor during the swap. Double-check all clamps and the MAF seating if a CEL appears.
Q7: Do I need an ECU tune after installing this intake?
A7: No tune is required for a bolt-on install that retains the factory MAF / IAT sensor at the OEM location and bore. The factory ECU's fuel trim range handles the small airflow change. If you also add headers, a larger throttle body, or other airflow modifications, an ECU tune can help optimize air-fuel ratios for maximum benefit — but it is not required for this kit on its own.
Q8: Is this intake safe in rain or deep water?
A8: Normal rain driving and small puddles are fine — the heat shield routes intake air from outside the engine bay. The cone filter does sit lower than the factory-sealed airbox, however, so avoid deep standing water crossings. Water ingestion can cause hydrolock and severe engine damage. If you regularly ford water, consider a high-mounted filter relocation kit.
Q9: How do I clean and maintain the dry filter?
A9: This is a dry synthetic filter — no oil required, no MAF contamination risk. Remove the filter, tap out loose debris, and blow compressed air from the inside out. 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.
Q10: What does the intake sound like on a 2JZ-GE?
A10: You will hear a deeper, more aggressive induction note from the engine bay — especially above 3,500 RPM under heavy throttle. At idle and cruise, the sound is subtle. It is the classic 2JZ inline-six intake growl that the factory airbox was designed to mute. If you want a louder, more pronounced intake note, an open-element (short ram) style is louder than this heat-shield sealed kit.
Q11: What is included, and what do I still need to supply?
A11: The kit includes the mandrel-bent aluminum intake tube, the high-flow dry cone air filter (red), the heat shield assembly with mounting bracket, silicone couplers, stainless steel hose clamps, mounting hardware, and an installation guide. You supply basic hand tools (10 mm and 12 mm sockets, Phillips and flathead screwdrivers). The factory MAF / IAT sensor is reused from your stock airbox — it is transferred to the new tube during the install.
Q12: Will this work with an aftermarket larger throttle body or turbo inlet?
A12: This kit is engineered for the factory 2JZ-GE throttle-body bore (76 mm intake diameter). If you run an oversized aftermarket throttle body or an aftermarket turbo inlet, the silicone coupler and tube length may not match. Verify the coupler size and routing with our support team before ordering.
Q13: Why does this SKU not carry a CARB Executive Order?
A13: Flashark has not submitted this SKU (FLIS25129) for CARB Executive Order testing for the 2001-2005 Lexus IS300 / Toyota Altezza 2JZ-GE application. Without an EO, the kit is not legal for sale or use on road-driven vehicles registered in California and other CARB-adopting states. See the Compliance Notice section for the full disclosure.
Q14: Is this intake harder to install than a typical aftermarket part?
A14: On a 1-10 difficulty scale, this install is roughly a 3-4. The job involves removing the factory airbox and stock intake plumbing, transferring the MAF sensor to the new tube, bolting the heat shield, tube, and filter in place, and tightening the silicone couplers and hose clamps. No lift is required, no cutting, no welding, no permanent modifications. Budget 45-90 minutes for a first-time installer; an experienced wrench can finish in closer to 30-45 minutes.
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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
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