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The BLOX Racing performance filter kit with a 4.0-inch velocity stack and 4.0-inch silicone hose is intended for larger-diameter intake systems needing a matched filter and coupling. The kit pairs a velocity-stack style filter with a silicone connector sized to maintain smooth airflow and straightforward installation in custom or modified intake setups where a coordinated filter and hose dimension reduces fitment guesswork.
BLOX Racing Performance Filter Kit w/ 4.0inch Velocity Stack Air Filter and 4.0inch Silicone Hose
