Devils Own professional water injection kit £279.00 postage £12.00 This is a high powered high capacity water injection system for the Rover Turbo, it comes with all the fittings and instructions, it uses the washer fluid tank as it's reservoir or you can buy a separate tank. A water injection system like this can reduce intake temperatures by up to 20 degrees, depending on boost being used this can mean a 30-40 bhp gain and less chance of piston melt, when used with methanol the gains are even greater.