GGR Spun Aluminium Induction Kit Trumpet 60mm Dimensions:- Inlet - I.D 60mm O.D 65mm Filter End / Outlet - 158mm As fitted by GGR in our performance induction kits This UK made aluminium spun induction intake trumpet was carefully manufactured and design by artisan craftsman to increase the airflow of cold air into the engine, therefore increasing the engines performance and efficiency. The Induction is purposely spun to escalate the airflow's velocity, this is achieved by a gradual reduction in the diameter of the trumpet, otherwise known as the Venturi Effect. (see diagram below). Cosworth Tuning and Performance Parts Specialists Graham Goode Racing Lutterworth Road Aylestone Leicester LE2 8PH Tel 0116 2440080.