The 2018 Subaru WRX STi is a turbocharged legend — but the stock incandescent lighting leaves plenty of room for improvement. LED upgrades are 100% plug-and-play, dramatically brighter, and give your STi a clean, modern appearance. Here are the top lighting upgrades available.
Table of Contents
- Turn Signal LEDs
- LED Flasher and SmartTap
- Tail as Turn + Backup Module
- Backup Light LEDs
- Interior LED Conversion Kit
- Shop WRX STi LEDs at Ess K Customs
Turn Signal LEDs
7440-size front and rear turn signal LED bulbs deliver up to 510 lab-verified lumens — far brighter than the factory bulbs. Direct plug-and-play replacement that installs in minutes.
LED Flasher and SmartTap
Installing LED turn signal bulbs can cause hyperflashing due to lower current draw. The plug-and-play CF18 LED flasher relay corrects this — it's located under the dashboard and takes minutes to install. For more customization, the SmartTap module not only corrects hyperflashing but adds tap-to-signal, custom arrival/departure modes, and eight unique hazard patterns.
Tail as Turn + Backup Module
The Tail as Turn + Backup module enables the factory LED tail lights to also function as turn signals and hazards for a modern, custom look. By freeing up the stock rear turn signal bulb location, you can convert it to a secondary 921-size LED backup light for dramatically more visibility when reversing.
Backup Light LEDs
921-size XP50 LED backup bulbs deliver 410 lab-verified lumens of 6000K white output — especially valuable for STis with window tint where backing up at night can be difficult. Direct plug-and-play installation in minutes.
Interior LED Conversion Kit
The complete Interior LED Conversion Kit includes vanity lights, map lights, dome light, license plate lights, and trunk light — everything needed to overhaul the cabin lighting. Available in cool white, blue, and red with two brightness levels: Stage 1 (240 lumens) and Stage 2 (670 lumens).
Fitment: All 2018 Subaru WRX STi models, including those with the optional Performance Package. All upgrades backed by a 3-year warranty.
Shop WRX STi LEDs at Ess K Customs
Ready to upgrade the lighting on your Subaru WRX STi? As an authorized Diode Dynamics dealer, Ess K Customs carries the full LED lineup — turn signals, flashers, Tail as Turn modules, backup lights, interior kits, and more — with full manufacturer warranty.
