The inlet manifold is a primary source of performance gain in any engine. When they are produced they are relatively rough cast and this prevents the smooth flow of air through to the combustion chamber that we would like to achieve. The best way to do this is to 'port and polish' the entire inlet tract. Because 'steps' in the tract will cause turbulance and slow down the air flow, it is important to 'match' the porting on each of the induction engine parts. A ported cylinder head will loose a good deal of its benefit if the inlet manifold does not match at the mating face. This therefore means that the polished and ported Inlet Manifold is of great importance.

£295 (outright surcharge £75)