Ever since Subaru introduced the WRX STi to the world in 1994 (and finally made it available in the U.S. a decade later), Subaru enthusiasts have been modifying and upgrading every piece of this turbocharged legend. Here at Diode Dynamics, we engineer and manufacture the best LED lighting on the market, with a focus on bright, functional light output and long-term reliability.
And as great as the 2018 Subaru WRX STi is, the stock incandescent lighting leaves plenty of room for improvement. By replacing your STi’s factory lighting with brighter, more functional LED bulbs, you’ll not only get far better visibility, you’ll also get to enjoy a much cleaner, 21st-century appearance. All the Diode Dynamics LED bulb replacements listed below are 100% plug-and-play. There is no splicing, or wiring needed!
Diode Dynamics Turn Signal LED Bulbs
One of the easiest and most functional lighting upgrades you can do on your 2018 WRX STi is our 7440-size Front Turn Signal and Rear Turn Signal LED Bulbs. Providing up to 510 lumens, Diode Dynamics Turn Signal LED Bulbs are FAR brighter than the STi’s stock lighting, and install in just a few minutes!
Unlike generic LED turn signal bulb replacements that have estimated lumen ratings, we actually measure the output of each of our bulbs in our laboratory in St. Louis, Missouri! If you are experiencing hyper blinking after installing LED turn signal bulbs, check out our CF18 Flasher Module or SmartTap Module below to quickly correct this!
Diode Dynamics Flasher Relay
Replacing incandescent turn signal bulbs with LED upgrades causes some vehicles to “hyper blink” or hyperflash due to the lower current draw of LED. Our plug-and-play LED Flasher Relay corrects this, and gives your STi an OEM-speed flash when turning or using your hazards.
On the 2018 WRX STi, the stock CF18 (LM449) flasher relay is located right underneath the dashboard, so installation only takes a few minutes!
Diode Dynamics SmartTap LED Flasher
For those who want more customizability than our standard LED Flasher Relay offers, the Diode Dynamics SmartTap Module is the perfect upgrade. The SmartTap not only corrects hyperblinking caused by LED turn signal bulbs, it also enables a host of unique functions such as: tap-to-signal, custom arrival and departure modes, and EIGHT unique hazard patterns!
Like our LED Flasher Relay, the SmartTap Module plugs right into the 2018 STi’s factory flasher relay location under the dash, and requires no additional modification.
Diode Dynamics Tail as Turn® + Backup Module
Just like the 2018 WRX STi, our Tail as Turn® + Backup Module is the perfect blend of form and function. This plug-and-play module enables the 2018 STi’s factory LED tail lights to also function as turn signal and hazards for a custom, 21st-century look!
By eliminating the stock rear turn signal bulb, you’re then able to convert that bulb location to a secondary 921-size LED backup light for dramatically more visibility when backing up at night.
Diode Dynamics Backup LED Bulbs
Our Backup LED Bulbs make reversing safer and easier. Especially for WRX STi’s with factory or aftermarket window tint, backing up at night can be difficult and potentially hazardous. With our drop-in LED bulb replacements, you’ll be able to see exactly what’s behind you thanks to the increased light output.
Featuring a crisp 6000K color temperature and 410 lumens of verified output, our 921-size XP50 LED Bulb is our #1 upgrade for the 2018 WRX STi’s backup lights. Best of all, installation only takes a few minutes using basic hand tools!
Diode Dynamics Trunk Light LED Bulbs
Stock, the 2018 WRX STi’s 194-size trunk lights simply aren’t very bright, which can make loading and unloading at night difficult. Diode Dynamics Trunk Light LED Bulbs are the ideal solution for dramatically better visbility, and a much more modern look.
Available in eight unique colors including: cool white, pure white, natural white, warm white, blue, red, amber, and green, our Trunk Light LED Bulbs provide up to 200 lab-verified lumens!
Diode Dynamics License Plate LED Bulbs
By replacing your 194-size yellowish stock incandescent bulbs with our License Plate LED Bulbs you’ll instantly improve the overall appearance of your 2018 WRX STi. In less than 5 minutes, you can install your choice of cool white, pure white, natural white, or warm white LED bulbs featuring as much as 92 lumens of light output.
As with all Diode Dynamics LED lighting, our License Plate LED Bulbs are backed by a 3-year warranty!
Diode Dynamics Interior LED Conversion Kit
Upgrading your 2018 WRX STi’s stock interior lighting doesn’t get any easier than with our Interior LED Conversion Kit! Featuring two 28mm-size vanity light bulbs, two 31mm-size map light bulbs, two 194-size license plate light bulbs, one 194-size trunk light bulb, and one 31mm-size dome light bulb, this kit includes everything you need to overhaul your STi’s interior lighting.
Our Interior LED Conversion Kit is available in cool white, blue, and red, as well as two distinct brightness levels. Stage 1 provides 240 lumens for a noticeable increase over stock, and stage two gives you a whopping 670 lumens, for maximum interior visibility!
Stay tuned to our blog and social media pages for more updates, and check out all of our lighting upgrades and bulb replacements for the 2018 Subaru WRX STi.
Have questions about lighting modifications for your vehicle? Contact us today!
Unsure which bulbs you need for your ride? Click here for our Vehicle Finder tool!
*The Diode Dynamics LED upgrades shown here are compatible with all 2018 Subaru WRX STis, including those with the optional Performance Package and factory LED interior lighting.
Share This Post