RB-series and SR-series engines in the R32, R33, and R34 Skyline platforms often suffer from restrictive factory airboxes that limit airflow and throttle response. The ISR Performance 3" Universal Cone Filter Shorty is a compact, high-flow intake solution that replaces the stock airbox with a free-breathing, reusable filter designed for maximum airflow in tight engine bays. This shorty filter is especially effective for upgraded turbo systems or high-revving naturally aspirated setups, helping unlock horsepower, sharper throttle response, and faster turbo spool—crucial advantages for drift, street, and track applications.

The oiled cotton-gauze filtration media, supported by a durable wire mesh structure, moves significantly more air than stock filters while still capturing fine particulates that can harm engine longevity. The short profile (3" top, 4" base, 3-5/8" height) with a 3" clamp inlet makes it ideal for RB26, RB25, SR20DET, and SR20DE swaps where space around the radiator support or intercooler piping is limited. Whether used after the mass airflow sensor or in an open-element cold air system, it delivers consistent airflow even under high-boost or high-RPM demands.

At Terra Firma Automotive, we supply this genuine ISR Performance 3" Universal Cone Filter Shorty as a dependable filtration solution for enthusiasts seeking a compact yet high-capacity intake component. Fully reusable and built to withstand vibration, heat, and the demands of 300–600+ horsepower builds, this filter is a smart, long-term upgrade that supports E85 and other performance fuels. For builders focused on maximizing airflow and reliability in confined engine bays, this shorty cone filter is one of the most effective and practical upgrades you can make to your Skyline.

• ISR Performance 3" Universal Cone Filter Shorty for RB/SR engines
• Compact dimensions: 3" top, 4" base, 3-5/8" height
• 3" clamp inlet for easy integration into intake systems
• Oiled cotton-gauze media with wire mesh support for high airflow
• Captures fine particulates while flowing significantly more air than stock
• Ideal for tight engine bays in R32, R33, and R34 Skyline swaps
• Supports 300–600+ horsepower applications with excellent efficiency
• Fully reusable filter for long-term performance and cost savings
• Compatible with mass airflow sensor or open-element cold air setups
• Enhances throttle response and turbo spool on upgraded systems
• Durable construction withstands vibration, heat, and high-RPM use
• Perfect for RB26, RB25, SR20DET, and SR20DE builds
• Premium ISR quality with proven real-world results
• Essential intake upgrade for improved airflow and reliability
• Trusted by Skyline enthusiasts for compact high-flow performance
• ⚠️ Emissions / California Legal Disclaimer – Off-Road / Competition Use Only: This product is intended for off-road, competition, and track use only. It is not legal for sale or use on public roads or highways in California (or any other CARB-adopting state). For more information Click Here.