SKU: 710-111-102
Weapon R Secret Weapon 4 SW1 Air Filter Gunmetal/Black – Universal 4 Inch Inlet
The Weapon R Secret Weapon 4 SW1 Air Filter in gunmetal/black fits vehicles with custom 4-inch intake systems. This universal conical filter increases throttle response and engine power by pulling in cooler denser air. Its hybrid design works reliably on street and track for cars trucks and motorcycles.
Key Features
- Hybrid Conical Shape: Large 7-inch top diameter captures high air volume while 7.5-inch base and tapered sides create a tight seal against the intake tube
- Dry Synthetic Nanofiber Media: Traps 99 percent of contaminants down to 5 microns with up to 60 percent more airflow than stock filters
- Gunmetal Powder-Coated Top: Corrosion-resistant finish pairs with black filter body for long-lasting durability and sharp appearance under the hood
- 4-Inch Inlet Flange: Precision-machined rubber flange clamps securely to standard 4-inch aluminum or silicone intake tubing
- 7-Inch Filter Height: Balances compact size with substantial pleated surface area for sustained high-flow over the filter life
Product Notes
- Filter media is fully washable and reusable with Weapon R cleaning kit for cost-effective maintenance
- Clean every 30,000 to 50,000 miles based on driving conditions to maintain peak flow
- Arrives pre-oiled and ready for immediate installation
Installation Notes
- Professional installation recommended.
- Slide over 4-inch intake tube and secure with 4-inch hose clamps not included
- Compatible with all Weapon R Secret Weapon intake kits and most aftermarket 4-inch systems
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| Universal | All | All Models | 4″ Inlet Intake Systems |
Why Choose Weapon R?
- 25+ years engineering high-flow intake components trusted by racers and enthusiasts
- Dyno-proven gains in horsepower and torque across thousands of dyno pulls
- Precision manufacturing in the USA with limited lifetime warranty on filter media
Frequently Asked Questions
- Q: Will this filter fit my custom intake setup?
A: Yes it fits any 4-inch diameter intake tube on cars trucks or motorcycles with compatible piping - Q: What material is the filter media?
A: Dry synthetic nanofiber requires no oiling traps dirt effectively and flows more air than oiled cotton alternatives - Q: What is the warranty and cleaning process?
A: Limited lifetime warranty on media clean with Weapon R kit spray rinse and air dry completely before reinstalling
Shipping & Handling
- Method: UPS Ground or FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Secure manufacturer box 10 x 10 x 9 inches
- Weight: 1.8 lbs
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