Description
Improve throttle response, midrange pull, and top-end power with the STILLEN Enclosed Air Box Intake System for the Nissan Frontier, Pathfinder, and Xterra. Designed specifically for the D40, R51, and N50 chassis platforms, this system replaces the restrictive factory intake with a true cold air solution that delivers measurable performance gains without sacrificing reliability.
Unlike open-element intakes that draw in hot under-hood air, this STILLEN system features a fully sealed roto-molded intake box that isolates the filter from engine bay heat. The result is a consistently cooler and denser air charge, helping improve horsepower, torque, and overall drivability — especially from the midrange through the top end.
At the heart of the system is a high-quality STILLEN washable dry air filter with a large surface area and integrated velocity stack. This design improves airflow efficiency using the venturi effect while maintaining excellent filtration. The dry filter requires no oiling, making maintenance simple and mess-free.
The intake tube and air box are engineered to smooth airflow and reduce restriction, allowing the engine to breathe more freely. This increased efficiency can also contribute to improved fuel economy during normal driving.
Installation is straightforward and can be completed with basic hand tools in your driveway. The intake is fully compatible with the factory ECU, meaning no tuning is required and no check engine light issues.
Beyond performance, the enclosed black intake box and clean layout significantly enhance the engine bay’s appearance, giving your truck or SUV a purposeful, performance-oriented look.
Key Features & Benefits
- Up to 11 WHP peak gain for stronger midrange and top-end acceleration*
- True cold air intake design with fully sealed air box
- Roto-molded intake enclosure shields intake air from engine heat
- Improved torque for better daily drivability
- Larger surface area dry air filter enhances airflow and throttle response
- Washable STILLEN dry filter – no oiling required
- Improved airflow efficiency may help increase MPG
- Smooth airflow intake tube reduces restriction
- Aggressive yet refined intake sound
- Runs perfectly on OEM ECU – no tune required, no CEL
- Simple bolt-on installation – driveway friendly
- Designed and manufactured in the USA
- Not CARB legal – not for sale in California
*Results may vary.
Vehicle Fitment
Fits the following vehicles equipped with the factory naturally aspirated V6 engines:
- 2005–2017 Nissan Frontier (D40)
- 2005–2012 Nissan Pathfinder (R51)
- 2005–2013 Nissan Xterra (N50)
Direct bolt-on fitment for the vehicles listed above only.
