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SKU: 305-123-101
Weapon R Secret Weapon Intake System for 2000-2005 Lexus IS300
The edge in engine performance with the Weapon R Secret Weapon Intake System (SKU: 305-123-101), engineered for the 2000-2005 Lexus IS300's 3.0L V6. This intake system uses patented physics—the Coanda Effect and Bernoulli's Principle to produce dual-velocity airflow inside the tube, with one stream accelerating for sharp throttle response and the other delivering steady volume. Dyno tests from Tuner Performance Reports Magazine placed it ahead of cold air and short ram intakes, confirming its lead in horsepower and torque delivery for drivers who demand noticeable gains in acceleration and response.
The design feeds up to three times more air to the engine than stock setups, sharpening power across the RPM range while adding a distinctive intake note under load.
For Lexus IS300 and compatible models, this bolt-on system installs quickly without cutting or drilling, keeps factory filtration standards via its high-flow foam element, and supports easy maintenance to hold costs low over years of use. With a 1-million-mile limited warranty, it stands as the reliable upgrade that consistently outperforms alternatives in real-world testing, making it the go-to for enthusiasts building on the 2JZ-GE's potential.
Vehicle Fitment
This direct-fit intake ensures seamless integration for:
- Years: 2000-2005
- Make: Lexus
- Model: IS300
- Engine: 3.0L V6 (2JZ-GE)
Additional Compatibility:
- Years: 2001-2004
- Make: Lexus
- Model: GS300
- Engine: 3.0L V6 (2JZ-GE)
Note: This product is not CARB-certified and cannot be sold or used in California vehicles subject to emissions standards.
Part Number
- Primary Part Number: 305-123-101 (US Patent #7,263,961 B2)
What's Included in the Purchase
The complete kit provides everything for a plug-and-play installation:
- Mandrel-bent 6061-T6 aluminum intake tube (polished for durability and heat resistance)
- Conical Secret Weapon air filter (1-inch thick high-flow polyurethane foam with tuned velocity stack to cut turbulence)
- Stainless steel worm-gear clamps (two included for secure fit)
- Silicone adapter coupler (connects to throttle body with airtight seal)
- Mounting brackets, bolts, and hardware (for stable engine bay positioning)
- Comprehensive installation manual (with diagrams and torque specs)
Specifications and Performance Details
- Construction: CNC-mandrel-bent 6061 aluminum tube for smooth laminar flow
- Filter Type: Reusable polyurethane foam clean every 30,000-50,000 miles using Weapon R filter oil (sold separately)
- Airflow Design: Dual-velocity profiles via Coanda Effect (air follows curves) and Bernoulli's Principle (faster speed lowers pressure), yielding three times the air volume of OEM intakes
- Filter Warranty: Lifetime limited on the element
- System Warranty: 1-million-mile limited against defects
- Tested Gains: Up to 10-15 horsepower and 12-18 lb-ft torque at 3,500-6,000 RPM (results vary by tune and setup) magazine-verified lead over competitors
- Sound: Deep induction roar on acceleration, subdued at cruise
Product Weight and Shipping Information
- Package Weight: 6 lbs (2.72 kg)
- Shipping Box Dimensions: 24" L x 9" W x 9" H (61 x 22.86 x 22.86 cm)
Equip your 2000-2005 Lexus IS300 with the Weapon R Secret Weapon Intake (305-123-101) and claim the performance advantage proven in head-to-head tests. This is the intake that turns everyday drives into dynamic experiences.
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