The high-output, genuine Bosch "Blue" coil is perfect for most 12 volt 4 and 6 cylinder applications. This coil does not require a series ignition resistor. Many hard-to-track-down ignition problems are eventually traced to a defective coil, so it's cheap insurance to carry a spare.
Note: Bosch has changed the look of the venerable "Blue" coil. It's no longer painted blue. It just has a blue label. However, Bosch has assured us that none of the quality or performance specifications have changed.
Mounting clamps available separately:
Ford Racing Universal Coil Bracket (Part No. M-12044-A2)
Clamp-On Coil Bracket for 1 1/2" Tubing (Part No. 1318-001)
Clamp-On Coil Bracket for 1 3/4" Tubing (Part No. 1318-002)
The Bosch Blue coil is very good up to about 7500rpm on a 4 cylinder engine. We also offer the Lucas High Energy Coil (Part No. 1305), which offers slightly better high RPM performance.