Included in each kit is a velocity stack, filter, and a hose clamp to connect the two together.

3" - The velocity stack has a 6" inlet and a 3" outlet. All you need to connect it to your 3" cold air intake is a 3" silicone coupler and (2) hose clamps. The velocity stack has a 2.25" overall height. Fully assembled, the filter and velocity stack has a 6.25" overall height and 7.5" diameter.

3.5" - The velocity stack has a 6" inlet and a 3" outlet. All you need to connect it to your 3.5" cold air intake is a 3.5" silicone coupler and (2) hose clamps. The velocity stack has a 2.25" overall height. Fully assembled, the filter and velocity stack has a 6.25" overall height and 7.5" diameter.

NOTICE: Hybrid Racing recommends always running the filter on the cold air intake. While slight gains can be seen by pointing the velocity stack into oncoming air without the filter, this puts the engine at risk as unfiltered air can cause unwanted debris to enter your engine.