Do I need to splice into my factory wiring harness?

The included switch and harness are self-contained—you'll tap into a switched 12V source under the dash. No splicing into OEM circuits needed. Your service manual will point you to the safest tap point.

Will these fit factory mounting points without drilling?

These are designed for the factory fog light locations on your hatchback. Mounting method and bracket configuration not specified—test-fit before committing to fasteners to confirm alignment.

Can I upgrade to a different bulb wattage later?

H11 is the socket type on these housings, so any H11 bulb will fit. Stay within your vehicle's electrical limits—check your service manual for safe amperage draw on the circuit you're tapping into.