Lucky You: You can get almost every current bit of technology on the Sierra, except good headlights! Luckily for you, the Morimoto Retro-Quik system is designed as a direct bolt-on upgrade for a big performance boost inside the headlights on all 2014+ Sierras.

Bi-Xenon Projectors: Truth be told, for a bunch of headlight nerds: We could not imagine a more perfect projector. Just like Morimoto's D2S 4.0 - the standard G5-X Bi-xenon takes the cake in every category. A supreme low beam. A High beam so bright it's unholy. A cutoff line that can't get any sharper. Quality that nobody can question, and an undeniable ease of installation. If we died and went to headlight heaven, this thing would be greeting us at the gate.

Mounting Hardware: 100% Engineered in the US. Laser cut from automotive-grade G10 fiberglass. The Retro-Quik brackets at the heart of the kit are designed to adapt the G5-X Bi-xenon projectors directly in place of the unsophisticated stock units. Using the original mounting holes paired with new hardware, they are the beauty behind the kit that makes it an easy install. You're welcome.

Optional HID Ballasts: Designed in California by Morimoto's engineer, Yoshi Ishida, the Morimoto XB 2.0 HID Ballasts are just as good looking on the outside as they are well-engineered on the inside. They are available in both 35w and 50w versions, use proprietary software by the pros at Hylux paired with packaging perfection from the masters at Morimoto. This is today's most modern iteration of a model that has sold more than half a million units since inception, and we don't think it can really get any better!

Optional D2S HID Bulbs: Homegrown by Morimoto to out-perform any alternatives on the market when installed in projector-based headlight--and it shows. We admit the latest generation XB HID bulbs are pretty impressive when compared to other bulbs, and even older Morimoto bulbs. At the heart of the XB bulbs is their perfectly-aligned 100% Philips quartz glass capsule that houses high quality halide salts from German-supplier Messer. In our annual lux comparison test, they produced nearly the same lumin Osity (intensity) as the industry benchmark Osram CBI bulbs at 5500K. No, you're not seeing things here, but yes you will be seeing everything at night.

Optional Relay Harness: As one of the most important parts in any HID lighting upgrade, don't skimp out when it comes to your wiring. It doesn't matter how good your ballasts are or how good your bulbs are, if your harness is a piece of crap, when it gives out your headlights are gonzo. The Morimoto HD Relay harness is easily worth the premium price compared to cheaper alternatives. With triple-sealed twin relays, 14ga. stranded copper wiring, over-molded fittings, and plug-n-play functionality, it will ensure everything functions properly and permanently from the original in-cabin controls. It's easily the best headlight wire harness out there.

Optional High Beam Splitters: Double high beams?! whaaaat! Put simply, the optional Morimoto high beam splitters allow you to make this feature work easily without any cutting or splicing to the factory wiring by diverting power from the halogen bulb into the projector's high beam solenoid, making them both work at the same time.

Optional Housing Sealant: Protection is priceless! When you're putting together a set of high-end headlights, the last thing you want is moisture in 'em the first time it rains outside. RetroRubber is the most effective way to make sure the original seal is fully restored. For the small price, why anybody wouldn't prevent their new headlights from fogging up is beyond us. It'll be the best twelve bucks you've ever spent.