Daytona Twin Tec 3 Ohm Mini Coil This a miniature coil that is intended for custom motorcycles where space is at a limited and a single-fire coil is required for maximum performance. The 3 ohm primary is compatible with Twin Tec ignitions and most newer aftermarket single-fire ignitions. Features: Miniature coil intended for custom motorcycles where space is at a premium and single fire is required for maximum performance 3 ohm primary is compatible with Twin Tec Models and most aftermarket single fire ignitions including Compu-Fire, Crane Hi-4, and Dyna 2000 Overall dimensions: 2.4 x 2.3 x 1.6 (not including terminals and tower)