Velocity stacks help for smoother airflow. This, in turn, supplies more air to the engine and if there is more air, you can burn more fuel which ultimately ends in the engine making more power.Here is a simple way to make them and increase the potential power
Note that these fit the 39mm carburator model could also fit a v4 or v8 but are tested on a Johnson v6 175 faststrike form 1994.
For those who seek maximum performance
boat engine parts,marine accessories