BLOX Racing BXIM-00311-BK 3.5" Velocity Stack Filter Kit Black Composite

Vehicle Fitment

Universal - compatible with any naturally aspirated or turbocharged vehicle with a 3.5" (89mm) intake tube or throttle body inlet. Confirm your intake tube diameter before ordering. Also available in 2.5" (BXIM-00309), 3" (BXIM-00303), and 4" (BXIM-00310) neck sizes.

Fitment Notes

• The 3.5" (89mm) neck diameter fits directly onto a 3.5" intake tube or throttle body inlet. The included black 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.
• Dyno-proven to increase horsepower and torque in BLOX Racing's own testing versus restrictive factory and low-quality aftermarket filter setups.

Features

• BLOX Racing 3.5" Performance Air Filter Kit - a complete filter assembly combining a 3.5" composite velocity stack, 7" tall dry element high-flow air filter, and 3.5" black silicone hose coupler with clamps. The 3.5" neck diameter sits between the 3" and 4" options in the BLOX Racing kit range, suited for mid-to-high-flow turbocharged and naturally aspirated builds running 3.5" intake tubing or throttle body inlets.
• PA66 glass-filled nylon composite velocity stack - injection-molded from PA66 glass-filled nylon, the composite construction significantly reduces heat soak compared to aluminum velocity stacks, transferring less thermal energy to incoming charge air for a cooler, denser air charge entering the intake system.
• Dry element air filter, 7" height, 6" OD - oil-free design eliminates the risk of MAF sensor contamination associated with oiled performance filters. The 7" tall, 6" wide filter element provides a generous surface area for maximum airflow capacity with minimal pressure drop across the filter media.
• Black silicone hose coupler with clamps - heat-resistant and flexible, providing a secure airtight connection between the velocity stack and intake tubing for long-term reliability in underhood conditions.
• Bell-mouth velocity stack inlet geometry reduces intake turbulence at the filter-to-intake transition, optimizing airflow velocity and volume entering the induction system.
• Ideal for naturally aspirated and turbocharged applications.

Specifications

• Part Number: BXIM-00311-BK
• Neck Diameter: 3.5" (89mm)
• 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: 3.5", 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 3.5" Composite Velocity Stack (Black PA66 Nylon)
• 1x BLOX Racing Performance Dry Element Air Filter (7" Height, 6" OD)
• 1x 3.5" Black Silicone Hose Coupler
• 2x Hose Clamps

Product Description

The BLOX Racing BXIM-00311-BK is a 3.5" performance air filter kit combining a black PA66 glass-filled nylon composite velocity stack, 7" tall dry element air filter, and 3.5" black silicone coupler with clamps. It fits any vehicle with a 3.5" (89mm) intake tube or throttle body inlet, serving as the filter assembly on a custom intake build or as a replacement for a factory airbox. The composite velocity stack reduces heat soak versus aluminum alternatives, and the 7" dry element filter provides high airflow capacity with oil-free filtration safe for MAF sensors and mass airflow meters.

BLOX Racing's testing shows dyno-proven horsepower and torque improvements over restrictive OEM and budget aftermarket filter setups. The 3.5" kit is the mid-upper option in the BLOX Racing velocity stack filter range, bridging the 3" and 4" kits for applications running 89mm intake tubing. Not CARB legal - not for street use in California. Additional neck size options: 2.5" (BXIM-00309), 3" (BXIM-00303), and 4" (BXIM-00310).