Daft question, but have you thought about the Catalytic Converter? Regards, Andy. Audi Owners Club http://www.audioc.force9.co.uk editorial@audioc.force9.co.uk Telephone: +44 (0) 1909 500156 Mobile: (UK) 0836 568978 Snail Mail: 18 Victoria Road, Worksop, Notts. S80 2HF. England ICQ: 25397079