I have the motordyne, its been on the car about 6months, Changed the plugs on sat to find the 4towards the rear of the engine bay to be fairly white in colour, normally showing that the fuel mix is lean. Anyone else expeirenced this? I have now removed the spacer. Going to run the car for a while and check the plugs again. If the spacer is causing the engine to run lean this could lead to some expensive valve repairs in time to come.