Strategically control air flow with Injen's step down process! It will regulate airflow at strategic points within the air intake to control the rate and density of the air flowing through it for more reliable power gains. - See more at: http://www.stillen.com/product/intake-kits/injen-sp-series-intake-system-black-sp3009blk-injsp3009blk-122687.html#sthash.zvBcYODI.dpuf
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