Do I need to splice into the factory wiring harness?

Wiring harness is included, but connection method depends on your comfort level. If you're not familiar with electrical work, have a shop handle the final connections to avoid shorts or blown fuses.

Will the clear lenses stay bright, or do they yellow over time?

Clear polycarbonate lenses can yellow from UV exposure and road salt over several years. A UV-protective clear coat or aftermarket lens cover can slow the process if you're parked outdoors regularly.

What if one bulb burns out — can I replace it easily?

H11 bulbs are standard and widely available. The housing design allows front access, so replacement should take under a minute once you're comfortable with the assembly.