The original Cosworth YB plenum did not supply an even distribution of air to each cylinder, meaning that while one cylinder’s mixture is fine, another could be rich because it is getting
less air.

This becomes more critical with increased performance of the engine. Burton Power’s modified plenum uses a high air-flow venturi design to supply an equal amount of air to
each cylinder resulting in power gains of 10-25 bhp depending on the engine specification.

The plenum has been machined with ‘O’ ring sealing joints for both manifold and throttle body faces and made from a strong alloy casting, which will not split under high boost pressures, unlike welded manifolds. It comes complete with a full fitting kit.

The part retails at £399 inc VAT and is available via or 0208 554 2281 ENDS.