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Cai diameter tubing and velocity stacks

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Old Jun 19, 2013 | 10:56 AM
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Default Cai diameter tubing and velocity stacks

Hey guys,

Anyone know what the pipe diameters are on the injen long tube or stillen gen 3 Cai's?

Also, I take it they use the small k&n filters due to space constraints in the front bumper but has anyone ever paired them up with velocity stacks?
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Old Jun 19, 2013 | 08:39 PM
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No one has any idea?
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Old Jul 5, 2013 | 06:23 PM
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The Injen are most likely 2.75 inch O.D. as the MAF section necks down.

The Stillen doesn't, so probably 2.5 inch O.D.

Also, a velocity stack does help smooth out flow at the inlet, but the largest gain comes from getting away from a straight cut pipe. The difference between a small radius and a large radius is pretty small.

Last edited by T_K; Jul 5, 2013 at 06:26 PM.
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Old Jul 5, 2013 | 07:53 PM
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I also want to know if I could pair up some velocity stacks on my stillen Gen3s!!
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