Cast and machined to the same exacting standards as the throttle bodies, the manifold ensures exact alignment of the throttle bodies for perfectly matching airflows, and smoothly transitions the inlet shape from the round throttle body to the port shape of the head for the best power.

Two shapes of inlet are available for perfect fitment. “Port Angle” manifolds give a straight path for the air to travel so in many cases will improve peak power output. However, one of the main considerations in inlet design is inlet tract length. The desired tract length (which in many engine bays is actually not achievable due to space limitations) should not be compromised by the desire to use a “port angle” manifold. In restricted engine bays always use the manifold that puts the throttle bodies into the most clear space to allow the longest inlet tract.

15mm long airhorns are fitted as standard in the package as they are the shortest fitment so fit the most engine bays. The total system length is made up by the head port, inlet manifold, throttle body and air horns. Theory tells us that shorter system lengths give power gains at higher rpm and vice versa. In many applications the engine bay dimensions limit the system length to shorter than optimum so you fit the longest system you can.

If our air filter system doesn’t fit into your engine bay, sock filters will need to be used, these are not as good for performance but will keep your engine safe.

An air filter should always be used. Below are dimensions with and without air filters. We supply foam filters from market-leading UK companies as they couple good filtering with high flow and so a correctly sized air filter will NOT limit power whilst still providing excellent protection for your engine.