leebay- the plug covers i made from a sheet of aluminium, same as the surround for the air filter, although i got some one to use a circular saw to get the plug covers cut to just the right width
bitterend- the manifolds were made by Powerspeed who at the time were in hothfield, but have recently moved into ashford. not sure if they made much difference to power, but they made a huge difference to how smooth the car goes between 3-4000rpm