my ballasts (all 4 of them! ) are mounted inside the bumper... I didnt want them taking up space in the engine compartment, plus they're more protected in the bumper.

Get a 9006 specific kit if they are going in your stock headlights... then the bulbs just go in like the stock halogen bulbs, the wirring between the bulb and ballast just plugs in and the wirring from the stock headlights can be used to power the ballasts... some ballasts (philips) have a 9006 style connector already on them, so the stock headlight harness just plugs right into it.