Inlet Manifolds

The inlet manifold is responsible for introducing air into the cylinder head from the throttle body, avoiding hot surfaces which can heat the air leading to reduced engine efficiency.

Good gains to low and mid-range power can be made by boring, re-profiling and smoothing, the internals of the inlet manifold – particularly with turbocharged and high-output engines. Engines fitted a badly designed inlet manifold can be improved almost beyond recognition.

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Where practically possible, we remove marks left from the casting process from the inlet runners, leaving smooth surfaces with minimal obstruction to the flow of air. Where part of a runner forms a link between the injector boss and the head, the inside is ‘ribbed’, to allow for better fuel/air atomisation and to effectively make the runner an extension of the inlet port.

The throttle body bore is smoothed and bellmouthed to assist with air flow, particularly to runners that would otherwise draw less air flow and consequently run leaner (thus helping balancing the power across the cylinders - similar to how individual throttle bodies operate).

All units are thoroughly cleaned and degreased and are powdercoated in one of several common colours - ideal for custom and show cars.

Examples of our Work


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Fiat Uno Turbo, Ford Granada Cosworth, Subaru Impreza STi.

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Renault Clio 182 Sport (x2), VW Golf GTi.

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Honda S2000, Audi Coupe Quattro, Jaguar XJ-SR V12.

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Vauhall Calibra V6, Ford Fiesta RS Turbo, Renault Alpine GTA.

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Peugeot 306 GTi-6, Ford Sierra Cosworth, Renault 21 Turbo.

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Fiat Coupe 20v Turbo, Vauxhall Calibra V6, Vauxhall Vectra GSi.

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Nissan 200SX Turbo.

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