It kinda seems odd the factory bulb choices for the Sport headlight package. I'm used to the "traditional" method of lighting the bulbs where the "low beam" bulbs are a dual element bulb, while "hi beams" are usually single element bulbs. It seems with the Sport headlamp package when you use a 9007 in the low beam position and a 9004 in the hi beams you are using two dual element bulbs. Why? Usually, "low beams" are the low beam elements of the outer bulbs, and the hi beam bulbs aren't lit. Hi beams are usually the hi beam elements of the outers and the single elements on the inners (although some other brand vehicles use all single element bulbs, and simply shut the low beam outer bulbs off when the hi beams are on). But I've never noticed that all 4 bulbs were lit in low beam mode. So, at that point, why use dual filament hi beams? Are they firing both filaments in any of the bulbs in hi beam mode? What am I missing here? In factory trim, what elements of what bulbs are firing when? I have read that some people prefer the pattern of running the low beam elements in the outer lights during hi beam operation. Since I'm getting ready to upgrade to Sport housings I'm trying to do my homework, and deciding what bulb light fires when determines how to design my relay package. Thanks, Willie.