Will this light fit if I still have my original hatchback spoiler?

Yes. This assembly is designed for OEM mounting points on the hatchback spoiler — no modification needed. Just make sure your existing spoiler is in good condition before installing.

How much brighter is the LED compared to the stock bulb?

LED brake lights activate faster and produce more uniform light output than incandescent bulbs. You'll get better visibility and faster response time, which matters when you're braking hard.

Do I need to run new wiring, or does this plug into the factory connector?

Wiring configuration not specified — confirm your vehicle's third brake light harness before purchase to avoid incompatibility. Contact us with your VIN if you want to verify beforehand.