SubiSpeed DRL Harness for OEM LED Headlights

2015-2017 Subaru WRX Limited & STI



In Stock

Give your WRX or STI’s stock headlights true daytime running light function by grabbing SubiSpeed’s drop-in DRL wiring harness!
You will earn Reward Points with this Purchase.


The Original 2015+ WRX / STI DRL Harness

  • Turns the stock Boomerang C-light into a real DRL
  • Complete wiring harness with new fuses and quick-taps
  • Easy installation with only minor splicing
  • Turns outer OEM C-lights into a full-time DRL
  • Activates Boomerangs when handbrake is released

Gives your WRX or STI’s Stock Headlights True DRL Function

While the 2015-2020 WRX Limited and STIs come with some of the meanest headlight designs ever put on a stock Subie, but they do have a slight issue. Their aggressive C-clamp “boomerang” LED strips only come on when your high or low beams are actually on. That’s where SubiSpeed’s Boomerang DRL Harness comes in. The True DRL Wiring Harness for 2015-2020 WRX Limited and STIs makes your Subie’s C-clamp Boomerangs come on as soon as you release the handbrake, regardless of your headlight switch position. The end result is an awesome, eye-catching look 24/7 in a complete wiring harness that easily installs with only minor amounts of splicing.

Complete Wiring Harness for Both OEM Headlights

SubiSpeed’s DRL Harness comes with everything you need to get a true DRL setup on your Subaru WRX or STI. The harness consists of a pair of add-a-fuses that drop into your Subie’s engine bay fuse box and tap into fuses that have constant 12-volt power when you release the handbrake, along with quick-taps for connecting to the stock headlight wiring harness. The two add-a-fuse kits use 5-amp fuses, and the harness is pre-cut to reach both front headlights without the need for extending it yourself. The harness taps into the stock wiring with minor amounts of splicing and adding a pin to the factory wiring connector. Each harness comes backed by a 1-year limited warranty from SubiSpeed

  • 2015-2020Subaru WRX Limited
  • 2015-2020 STI

WRX Limited only: this harness will only fit WRX Limited models with C-Clamp “Boomerang” headlights, and will not fit base WRXs with base halogen reflector headlights.

Will not fit Australian models: this harness will not fit Australian domestic market Subarus, since the Australian cars have a DRL P13W fog light.

Requires minor wiring: the harness requires minor levels of splicing and tapping for installation.


There are a few options when wiring the SubiSpeed's DRL harness. We'll guide you through those in the instructions / videos (coming soon).

1) High Beam DRL + Boomerang / C-Light / Front Side Markers
2) Boomerang / C-Light / Front Side Markers (MOST POPULAR)
3) High Beam DRL + Boomerang / C-Light / Front Side Markers + Accessories
4) Boomerang / C-Light / Front Side Markers + Accessories
5) High Beam DRL + Accessories
6) Accessories Only


We took all things into consideration while designing this simple harness. One goal was to preserve the stock components and basically leave them untouched or fully reversible. The harness uses add a fuses to make a safe connection inside the engine compartment fuse box. The circuits are protected from electricity flowing the wrong direction. Simply weatherproof your stock connections and just keep them there until you sell the vehicle. At that time you can sell the harness and put the stock lights back in. Oh we also included some t-taps in case you want to light up some accessories. They connect to this aftermarket harness and not your factory wiring. It provides a quick and simple solution.


  • Complete harness with 2x c-light connections and pre wired add a fuses (5 amp capacity)
  • 4x T-tap connectors for connecting accessories to the harness

NOTE: Does not include any bulbs. There are no user replaceable C-light bulbs on a limited WRX or STI. Not compatible with Australian models as they use a P13W bulb in the fog light as a DRL.


1 year manufacturer's warranty*


The additional tab on this product page has the instructions for a Limited / STI. They will not be routed the same way.

Anytime the battery is disconnected, there is a chance that the auto windows will need to be reset. This is an easy task to do. Just roll your windows down all the way and then roll them up all the way manually.

People who viewed this item also viewed

9 customer reviews

Average rating
(based on 9 reviews)
Ease of Installation
Fit / Quality
Overall Satisfaction
  1. Not bad

    By Tecnodestructo February 16, 2023

    First, it does what it says it'll do. However, the installation instructions leave a lot to be desired in terms of specifics. Especially when it comes to pulling the pins in the headlight plugs. Also, fitment in the fuse box is pretty janky. Finally, you need to watch the video for the WRX harness as well if you want to turn your oem hi-beam DLRs off (to be fair, I only watched the harness install part of the video, so it's possible it's in there). Overall, it does what is advertised, and install wasn't awful after a few trips to YouTube University.

  2. Not the best bang for your buck

    By Mouahaha January 2, 2023

    I received these as a Christmas gift. I was super excited at first, but after a 2 hour filled install, I think these aren’t worth it. The fuses that came in the kit was blown, leading me to diagnose all of my wiring. After every connection inspection, I decided to take a look at the kit and was in disbelief. I’d say the need to drop the price for this kit is necessary. You’re better off grabbing a new set of headlights.

  3. Awesome C Light!!

    By GENESIS July 22, 2017

    This was a straight forward install, the toughest part about the install was removing the retaining clip and replacing the wire. Watch some youtube videos on how other users took it out to ease this process. overall i love them! they look so much better than the stock high beam DRL. I wish the stock C Lights were a little brighter! but I have the JDM Fog lights to complement it. ***You have to unplug the DRL resistor on the passenger side, if you would like to disable the high beam DRL.

  4. Makes a world of difference

    By Matt May 8, 2015

    Nota bene: Disconnecting the fog light resistor requires PULLING the clip, not pushing, to release the two pieces. It took me a while to notice that... This is not a knock on Subispeed. If you're not an idiot like me, the install is super easy.

  5. Great Product

    By Michael April 1, 2015

    This is a great product. Install was pretty easy. Just remember that the parking break has to be disengaged in order for the DRL to turn on.

  6. Looks Awesome, Should Be OEM

    By Subaru Racer March 21, 2015

    This is awesome! I have wanted this feature since I got my car. I was driving around with my parking lights during the day so that the C light was on. I wanted to set my infotainment unit to switch to night mode whenever I turned on the headlight, but with the parking lights on, the night mode was enabled. With this harness, I could use the C lights as a DRL without having to have the tail lights/licence plat/side markers lights on and without toggling the infotainment system to night mode! This was harder to install for me at least because I didn't fully understand the instructions. I have provided a video on YouTube to help anyone who might need it. http://youtu.be/oRrk5BX40wA

  7. Somewhat satisfied

    By Kick3699 December 20, 2014

    First of all I own the STi. In the installation video Yo talks about unplugging the Factory high beam DRL if you don't wish to run the high beams along with the boomerang lights. I would like to add that it may be a fluke or just that I have an STi, but when I unplugged this harness my one touch window feature stopped working and my ECU through a MAF Sensor error. Final result is I plugged it back and everything went back to normal. Other than the option to disconnect the High Beams as DRLs I am pleased.

  8. really fast and easy!

    By Chris December 4, 2014

    This was super easy to do on my STI. Makes it look alot better during the day with out having your high beams on all the time. Only took about 20 min for the general install and about 5 more to tidy up. Thanks!

  9. Works Great!

    By Daniel November 7, 2014

    Works great, super easy install. I have this to use just my C-lights and my JDM LED Fog covers as DRLs. The included T-taps make connecting accessories a cinch. The connection is tight but I might end up soldering the connection point between this harness and the LED cover harnesses. I also may end up just having the LED cover for my DRLs. But that's the biggest advantage of using this harness, you can use it for any number of things and not worry about hacking up your car's factory wiring. SubiSpeed: Glad you're enjoying it Daniel! If you're looking for more slack in the wires, please refer to the additional tab on this page where we've added some pictures of how to install it.

Write Your Own Review

Only registered users can write reviews. Please, log in or register


No questions have been asked about this product.

Upload images for this product