Do these require any modification to the bumper or fascia?

The fog lights are designed as a direct fit for the TC. Test-fit before final installation to ensure alignment with your bumper opening — modifications vary based on condition and fitment preference.

Will I need to tap into my main headlight circuit?

No. The included harness and switch wire in independently, so you're not touching your factory headlight system at all.

Can I replace the bulbs myself later?

Yes. H3 bulbs pull straight out and are stocked everywhere — auto parts stores, online retailers, gas stations. Swap takes seconds once the housings are in.