GCS CS-Style F1 LED Rear Fog Light

2015-2020 Subaru WRX & STI / 2013-2017 Crosstrek

$89.00 - $95.00

SKU: XRW51-PARENTWe price match!


GCS now has an F1 CS style lamp for the 2015+ WRX / WRX STI. This also fits the 2013+ Crosstrek. Available in 4 different colors.

NOTE: Please see main description for differences for this product vs the Subispeed F1.


Fog Light Wiring Splitter

This product is optional, however it will allow you to connect your Rear Fog Light swiftly and effortlessly.

Plug and Play Harness

This item will allow you to wire your new light without tapping the factory wires. This speeds up the install and allows you to return your vehicle to a completely stock setup. For more details on this product, click here

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Red Lens with Chrome Reflector
Clear Lens with Red Reflector
Matte Black
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  • Slick, Formula 1 look in stylish package
  • LED rear fog light with both fog and brake functions
  • Several lens and housing color options
  • Comes with wiring
  • Easy install with straightforward wiring
  • Requires minor splicing for installation

Seen in SS Rear Fog / Brake Light Overview

Provides More Visible Signaling with Race-Inspired Look

The WRX and STIs sold in the United States don’t come standard with a rear-facing fog light, and adding one to your awesome Subaru is a subtle change in looks that is sure to turn a few heads. The GCS LED Rear Fog Light for 2015-2020 WRX and STIs features both a fog light and brake light function, with the brake like producing an F1-Style flasher function that gives your custom Subie build some racing pedigree. The GCS Rear Fog Light Kit is available with several different lens and housing colors so that you can get the perfect look for your wicked WRX or STI.

All-LED Design that Fits Perfectly in the Lower Valance

The GCS CS-Style F1 LED Rear Fog Light for the 2015-2020 Subaru WRX and STIs was carefully designed to fit in perfectly to the factory lower valance recess without the need for trimming or drilling. The rear fog light features an OE-style housing, but is entirely powered by a grid of LEDs. The LEDs feature both a high and low power function that allows them to function as both a fog light and an F1-style flashing 4th brake light. The GCS Rear Fog Light is available with a smoked lens and black housing, a red lens with a chrome housing, a clear lens and red housing, a clear lens with chrome housing, and a clear lens with matte black housing. The GCS fog light comes with wiring with quick-tap connectors and instructions.

  • 2015-2020 Subaru WRX
  • 2015-2020 Subaru STI
  • 2013-2020 Subaru Crosstrek

Minor splicing required: this brake like requires minor amounts of splicing for installation and function. Plug and play harnesses are available separately.

SubiSpeed Installation Video - Similar Model

Wiring notes for this model are below the video.


Red Wire - Brake Light Positive
Black Wire - Ground / Negative
Green - Running Light Positive

NOTE: Wiring for the Crosstrek can be routed directly to the tail light which has it's connectors on the OUTSIDE of the vehicle and not inside the cabin.

OPTIONAL Fog Light Wiring Splitter / Extension

If you want to wire this so that it only comes on with the fog lights you'll find yourself using a pretty long run of wire.

We've made a quick connect kit which will split the wires to the passenger side fog light. Just run the wire under the driver's side fender liner, into the vehicle, and along the door sills back to the trunk of the vehicle. The insulated connectors will be placed on the F1 light harness and extension. Just connect them together and you'll have a functioning rear fog light.

Includes splitter and extension with two pairs of connectors. The plug for the female end is not pre-attached so that the wires can easily be run through grommets in the firewall area. To purchase this addition, click here.

OPTIONAL Plug and Play Harness

This harness speeds up the install process. The stock wiring harness in the WRX / STI can be hard to crimp as the area is tight. Also owners who wish to return their setup to stock at any point and time can do so easily with this harness.

The harness has OEM style connectors on both ends which allows you to install this in-line with the factory wiring. 3 extensions allow you to connect the aftermarket fog / F1 lights.

  • Black - Ground (-) [connect to black wire on CS style lamp]
  • Red - Parking / Running Light (+) [connect to green wire on CS style lamp]
  • Yellow - Brake Light (+) [connect to red wire on CS style lamp]

To purchase this addition, click here.


  • F1 Style Fog Light Assembly
  • Mounting Hardware
  • Wiring Harness with Connectors
  • Fog Light Wiring Splitter / Extension (optional)


The bumper cover does not need to be removed in order to install this product. Simply undo the fasteners at the bottom of the bumper cover so you can gain enough access to knock out the factory plastic cap.

We highly recommend covering the lens of the new fog light casing with painter's tape or something similar during installation. This will prevent scratches while you maneuver it into position.

Our video will help your through the installation process, but please note the wires are different on this model vs the video. For reference, the OEM tail light wiring is as follows:

  • Black Wire - Negative aka Ground (wire to black wire on the new harness)
  • Brown Wire - Brake Light Positive (wire to red wire on the new harness)
  • Black Wire w/ White Stripe - Fog Light Positive (wire to green wire on the new harness)

If you use the fog light extension harness, the negative and fog light wires will be supplied by that harness. You will only use the OEM tail light harness for the brown wire (brake light positive).

You can wire the lamp as a solid brake light only. You would do this by connecting the fog light wire (green) on the lamp to the brown wire on the OEM brake light wire (brown). To make this only an F1 light and not run always at night, just connect the fog light wire (green) AND brake wire (red) to the brown wire on the OEM brake light wire (brown).

While many states allow brake lights that flash and then turn solid, some do not. Please refer to your local laws pertaining to this feature.

It is not required that you hook up the brake light wiring. You can run the product as a rear fog light only.

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11 customer reviews

Average rating
(based on 11 reviews)
Ease of Installation
Fit / Quality
Overall Satisfaction
  1. Dead Led no-redemption

    By Rudy February 4, 2023

    I bought this 9/21. Within 7 months one LED died, I am currently down 3 total. Seems pretty consistent complaint with this.

  2. Attention Getter

    By DJT August 11, 2022

    I've noticed I'm not being tail-gated as much anymore. The install is pretty straight forward, but it def helps to have a friend help fish the wire up to the trunk. Bought in Aug 2021 and it's still going strong.

  3. Meh.

    By CJCameron January 2, 2022

    The Model that i received in the mail is definitely not the model that is displayed on the website. I am sure that it's probably a redesign but save yourself some time and get the plug and play harness. First time using T Taps and I'm not a fan.

  4. Straight Forward Install

    By Anthony M September 5, 2021

    I installed this in roughly 30 minutes start to finish. It works perfect during night time or low light conditions, when headlights and taillights are on. However during the day it's off and the hyperflash does not work when I press the brakes. I followed the instructions to the tee and not sure if I did something wrong. I was under the impression it will light up and hyperflash anytime I press the brakes.

  5. Decent

    By David January 8, 2021

    I've had this light installed for over a year and still works excellent. Purchased with plug n play harness as well and made install process so easy. Nice and bright. Kind of wish it would work without the lights being on. But, non the less still awesome

  6. Had the lights since August 2020 - December 2020 when it stopped working

    By Kevin December 16, 2020

    Had these lights since August 2020-December 2020 when half of the lights stopped working. I contacted Subiespeed regarding it and they sent a replacement. Excellent customer service. I'll be installing the replacement sometime soon. Originally, I had ordered the wrong lights. I wanted the option for the reverse option since I purchased the wiring for it, but, these lights are great. They're extremely bright and it's a must mod. Especially with everyone driving aggressive around the WRX/STI tailgating, it's good to put those people on high alert when you brake check or come to sudden stops.

  7. Disappointment

    By Heather September 20, 2020

    Loved the look of this light. Stopped working after less then a year 😭

  8. Ok product

    By Rob May 24, 2019

    Bought this and the optional wire harness. Was easy to install. Lights worked for about 6 months. Then they started worked half the time. Now they dont work at all. Was kinda upset when they stopped working.

  9. Love this light

    By Anthony November 2, 2018

    Pretty easy to install. Love the look and the light function.


    By Dave May 22, 2018

    Easy to install, looks and works great! I lost one of the extra screws and Maddy sent me new ones out the next day thanks again Subispeed for all of your support!

  11. A+ Product

    By Steff September 17, 2017

    Really good fit and easy to install!! I'm very happy I purchased this item. Accents my car so well.

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