BLOX Racing BXIM-00310 4" Velocity Stack Air Filter Kit Black Composite

Vehicle Fitment

Universal - compatible with any naturally aspirated or turbocharged vehicle with a 4" (101mm) intake tube or throttle body inlet. Confirm your intake tube diameter before ordering. Also available in 2.5" (BXIM-00309), 3" (BXIM-00303), and 3.5" (BXIM-00311-BK) neck sizes.

Fitment Notes

• The 4" (101mm) neck diameter is the largest in the BLOX Racing velocity stack filter kit range, suited for high-flow turbocharged builds and larger displacement engines running 4" intake tubing or throttle bodies.
• The included 4" silicone coupler and clamps connect the velocity stack securely to the intake tubing.
• Not CARB legal - not for street use in California or other CARB-regulated states. Intended for off-road, competition, and track use where applicable.
• The dry element air filter does not require oiling. Clean with compressed air or a dry filter cleaner; do not apply filter oil.

Features

• BLOX Racing 4" Performance Air Filter Kit - a complete filter assembly combining a 4" composite velocity stack, 7" tall dry element high-flow air filter, and 4" black silicone hose coupler with clamps. Designed for high-flow intake builds on turbocharged and large-displacement naturally aspirated engines where 4" (101mm) intake tubing is used, providing maximum airflow capacity at the filter inlet.
• PA66 glass-filled nylon composite velocity stack - injection-molded from PA66 glass-filled nylon, reducing heat soak compared to aluminum velocity stacks. The composite construction transfers significantly less heat to the incoming charge air, keeping the inlet air cooler and denser for improved combustion efficiency in high-underhood-temperature environments.
• Dry element air filter, 7" height - oil-free construction eliminates the risk of MAF sensor or mass airflow meter contamination associated with oiled performance filters. The 7" filter element provides a large filtration surface area to maximize airflow capacity with minimal restriction at the 4" inlet.
• Black silicone hose coupler with clamps - secures the velocity stack to the intake tubing with a heat-resistant, flexible, airtight connection rated for long-term underhood use.
• Bell-mouth velocity stack inlet geometry optimizes airflow entering the induction system, reducing turbulence at the filter-to-intake transition for improved volumetric efficiency.
• Ideal for naturally aspirated and turbocharged applications. Dyno-proven to increase horsepower and torque versus restrictive OEM and budget aftermarket filter setups.

Specifications

• Part Number: BXIM-00310
• Neck Diameter: 4" (101mm)
• Filter Height: 7"
• Filter Outer Diameter: 6"
• Velocity Stack Material: Injection-Molded PA66 Glass-Filled Nylon (Composite)
• Velocity Stack Color: Black
• Filter Type: Dry Element (oil-free)
• Silicone Coupler: 4", Black
• Application: Universal
• CARB Status: Not Legal for California Street Use
• Package Dimensions: 8.0" x 7.9" x 7.7"

Included Components

• 1x BLOX Racing 4" Composite Velocity Stack (Black PA66 Nylon)
• 1x BLOX Racing Performance Dry Element Air Filter (7" Height, 6" OD)
• 1x 4" Black Silicone Hose Coupler
• 2x Hose Clamps

Product Description

The BLOX Racing BXIM-00310 is a 4" performance air filter kit combining a PA66 glass-filled nylon composite velocity stack, 7" tall dry element air filter, and 4" black silicone coupler with clamps. The largest neck size in the BLOX Racing velocity stack filter kit range, the 4" kit is designed for turbocharged builds and high-displacement naturally aspirated engines running 4" (101mm) intake tubing, where maximum airflow capacity at the filter inlet is a priority. The composite velocity stack reduces heat soak versus aluminum, and the 7" dry element filter provides high-flow, oil-free filtration safe for MAF sensors and other air measurement devices.

BLOX Racing's testing shows dyno-proven horsepower and torque gains over restrictive factory and budget aftermarket setups. Not CARB legal - not for street use in California. Additional neck sizes: 2.5" (BXIM-00309), 3" (BXIM-00303), and 3.5" (BXIM-00311-BK).