There are two kinds of bosch ignition coil here in the philippines, 1) with built-resistor 2-Terminal (lower price), 2) with external resistor 2-Terminal (higher price). Another brand that has built-in resistor is the Denso Coil, which has a built-in resistor but with 3-Terminal Coil. The one you bought is a lower price bosch coil which was made to make the coil much lower in cost, with a compromise between a high performance and good starting ability. The coils delivers lower output voltage to the plugs when starting as well as when the engine is running compared to the external-resistor type. So when you have a slight problem with your ignition system (i.e. hi-tension wires, spark plug) you may experience hard starting. These lower price bosch coils are commonly used in cars/jeep which don't have a three-wire connection coming for the ignition switch.