Thanks everyone for the advice. Fitted the pipes today. Give a deeper sound but not too loud. Will keep the cops happy. At the moment not touched the AI or carbs/jets.Looked at all the instrctions on the site and for a novice it looked too daunting! I will see how the plugs are after a week. A couple of mates have suggested that I should be OK. Dwight don't worry no plans for blackmail yet.