Injen 8-Layer Oiled Cotton Gauze Air Filter w/ Twist Lock - 4in ID / 6in Base / 7.75in H TWO PIECE The TBS has both a

The TBS has both a Serrated and Helix combination design

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The serrated/helix design (US PAT 07055513) creates turbulence in the intake manifold and increases air pressure in the combustion chamber for better performance

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Injen 8-Layer Oiled Cotton Gauze Air Filter w/ Twist Lock - 4in ID / 6in Base / 7.75in H TWO PIECE The TBS has both aWith a rich history in racing and the street performance, Injen Technology has proven itself as a leader in filtration engineering and technology. Lab tested and race proven, Injen's air filter line features state of the art designs and performance. All of Injen's 8 layer cotton gauze oiled air filters feature a tightly layered media that is specified for our use, along with a proprietary filter oil that includes highly advanced tackifiers to stop as