Blox Racing Performance Filter Kit w/ 3.0inch Velocity Stack Air Filter and 3.0inch Silicone Hose - BXIM-00303Blox Racing Performance Filter Kit w 3. 0inch Velocity Stack Air Filter and 3. 0inch Silicone Hose The BLOX Racing performance air filter kit features its 7" height performance air filter, a composite velocity stack, and silicone hose coupler with clamps. Kits are dyno proven to increase horsepower and torque. The dry element filter prevents any sensors from becoming soaked with oil that is normally associated with wet filter brands. BLOX Racing