Gale Banks demonstrates the Duramax L5P's ability to deliver astonishing head flow numbers when compared to the LML. In this episode, recorded last May at Banks Power HQ near Los Angeles, Nick Pregnitz and Paul Wilson learn how the movement of fuel in the cylinder helps make more power during combustion. The swirl can help deliver oxygen to ensure all the fuel burns in the cylinder. Without good swirl, the result would be a lot of smoke.