Extensive in house testing on the Ford Quad-Cam V8 engine on our Dyno-Dynamics chassis dyno has demonstrated that the standard throttle-body flows sufficient air out of the box. However, adding the exclusive Herrod Motorsport design Helix Spacer between the throttle-body and manifold increases air induction turbulence and air speed into the manifold. This results in sharper throttle response and increased power.