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That iconic wing is more than just a piece of plastic and carbon fiber. It is a statement, a functional piece of aerodynamics, and the crowning glory of the 2008-2014 Subaru Impreza WRX STI hatchback. For many owners, the journey to acquiring this symbol of performance is a rite of passage. According to a 2024 survey of Subaru enthusiast forums, over 65% of WRX hatchback owners consider adding or upgrading their rear spoiler a top-three aesthetic modification, yet nearly half are apprehensive about the WRX STI hatch wing install process, particularly the wiring and drilling aspects. This comprehensive guide is designed to demystify that process, transforming apprehension into accomplishment. We will walk you through every single step, from unboxing your new spoiler to the satisfying click of the third brake light illuminating for the first time.
| Aspect | Details |
|---|---|
| Difficulty | Moderate (requires comfort with drilling and basic wiring) |
| Estimated Time | 3-6 hours for a first-time install |
| Key Challenge | Removing the trunk liner and running the third brake light wire |
| Critical Tool | Torque Wrench and a High-Quality Drill |
| Cost (DIY vs. Pro) | $50-150 (DIY sealing/wiring) vs. $300-600 (Professional) |
Before you lay a finger on your car, preparation is paramount. Rushing this stage is the most common cause of installer regret. Gather your tools and create a clean, organized workspace. You will be working on your car's exterior paint and interior trim, so a methodical approach is your best friend.
You do not need a professional mechanic's shop, but you do need the right tools for a clean and safe WRX STI hatch spoiler install.
One of the first decisions you will make is sourcing your spoiler. The choice between an OEM (Original Equipment Manufacturer) unit and an aftermarket replica is a classic enthusiast dilemma. Understanding the difference between an OEM and an aftermarket STI spoiler is critical to setting your expectations for the WRX STI hatch spoiler install process itself.
An OEM spoiler, such as the one you might find from a supplier like Genuine Subie Parts, is designed specifically for your vehicle. It will come with all the necessary hardware, a pre-installed gasket, and perfect paint matching (if ordered pre-painted). The fitment is guaranteed, which simplifies the installation immensely.
Aftermarket spoilers, while often more affordable, can be a mixed bag. High-quality replicas can be nearly indistinguishable from OEM, but cheaper versions may require significant modification. A common issue is the gasket quality. As one Reddit user lamented, "My aftermarket spoiler didn't come with a gasket, and I spent two days sourcing the right butyl rubber tape to prevent leaks." If you go the aftermarket route, be prepared to potentially source your own sealant and double-check the integrity of the mounting studs.
This is the main event. We will break down the entire procedure into manageable phases. Take your time, and do not force anything. If something does not feel right, stop and reassess.
The first part of the job involves gaining access to the inside of the hatch. This is where many DIYers get nervous, but with care, it is straightforward.
The trunk liner is held in by a combination of plastic pop-clips and screws. Start by removing the plastic cover on the inside of the hatch handle. It should pry off carefully with a trim tool. Next, locate and remove all the visible pop-clips. Use your trim tool to pry the center pin up slightly, then you can remove the entire clip. There are also screws along the edges and near the license plate lights. Once all fasteners are out, the liner can be gently pulled away. It is held by Velcro-like material, so a firm, steady pull is needed. This exposes the inner skin of the hatch and the wiring for the existing brake light, which is our gateway for the new wing's wiring.
This is the most critical part of the physical installation. Accuracy here is everything. If your spoiler did not come with a template, you can often find a template for drilling holes for a STI spoiler online from the manufacturer or enthusiast forums. Alternatively, you can carefully create one using the spoiler itself.
Thoroughly clean the area on the hatch where the spoiler will sit. Position the spoiler (or template) exactly where it needs to go. Use painter's tape to mark the outline and prevent the drill from wandering and scratching the paint. The key is to start small. Use a small drill bit to create pilot holes first. Then, use a step-bit to carefully enlarge the holes to the exact size required for the mounting studs. A step-bit creates a clean, burr-free hole in the sheet metal. Deburr the holes thoroughly to prevent rust and ensure a clean fit.
Now, we address the most common question: How do I wire the third brake light on a STI wing?
The new spoiler has a third brake light that needs to be connected to your vehicle's brake light circuit. The goal is to run the wiring for the brake light from the spoiler into the car through one of the new mounting holes or a dedicated grommet. Feed the spoiler's wire harness down through one of the center holes.
Inside the hatch, you will see the main wiring harness for the hatch, which includes the wires for the existing high-mounted brake light. You need to tap into the brake light signal. Identify the correct wire using a wiring diagram or a multimeter. The brake light wire is typically green with a red stripe or red with a blue stripe on these models, but always verify. Do not guess.
Once identified, splice the new spoiler's positive wire to the vehicle's brake light positive wire. Connect the spoiler's negative wire to a clean, unpainted grounding point on the hatch's inner metal frame. Use crimp connectors with heat shrink tubing for a secure, weatherproof connection. Never use simple twist-on connectors. Neatly route and secure the new wiring with zip-ties away from any moving parts or sharp edges.
You are on the home stretch. Before placing the spoiler, apply a bead of sealant around the base of each mounting hole on the spoiler's gasket. If there is no gasket, create one with a continuous bead of butyl rubber tape. This step is non-negotiable for answering Do I need to seal the spoiler mounting holes to prevent leaks? with a resounding YES.
Carefully guide the spoiler's mounting studs through the holes you drilled. From inside the hatch, place the washers and nuts onto the studs. This is where your torque wrench is vital. The torque specs for the STI spoiler mounting nuts are typically low, often in the range of 10-15 ft-lbs (14-20 Nm). Overtightening can crack the spoiler's base or warp the hatch metal. Tighten the nuts evenly in a criss-cross pattern to ensure the spoiler sits flush.
Do not close up the interior just yet. Reconnect your car's battery. Have a friend press the brake pedal while you check that the new third brake light illuminates brightly. Check all other hatch functions (license plate lights, wiper, etc.). Once everything is confirmed working, carefully reinstall the trunk liner, ensuring all clips and screws are secure.
Take a step back and admire your work. You have just completed a modification that fundamentally changes the character of your car. The benefits of having a STI style wing on a hatchback are both aesthetic and functional. Beyond the aggressive look, it provides genuine downforce at higher speeds, increasing rear-end stability.
It is a moderate DIY project. It requires comfort with drilling into your car's body and performing basic electrical work. With this guide, patience, and the right tools, a competent DIYer can achieve professional results.
Yes, but it is more involved. The process is identical, but a base Impreza hatch does not have the reinforced trunk torsion bars of the STI. Adding the heavy wing can prevent the hatch from staying open, requiring an upgrade to STI-spec struts or torsion bars.
Professional installation typically ranges from $300 to $600, depending on the shop rate and the complexity if wiring is involved. The DIY cost is essentially just the price of tools and materials, often under $150.
You must create one. Use 1/4-inch wide butyl rubber tape (often called "ribbon sealer"). Run a continuous bead around the entire base of the spoiler, ensuring it will seal around every mounting stud hole.
Absolutely. The process for GR hatch spoiler removal is the reverse of installation. You will remove the trunk liner, unbolt the stock spoiler, and disconnect its wiring. The holes from the stock spoiler will not match the STI wing, so you will be drilling new ones and will need to plug the old ones with body plugs and sealant.
Completing your WRX STI hatch spoiler install is one of the most rewarding projects for a Subaru owner. You have not only enhanced the look of your car but also built a deeper connection with it. The skills you have learned here patience, precision, and problem solving are the hallmarks of a true enthusiast.
If you are ready to begin your project, sourcing the right parts is the first step. For a guaranteed fit and finish, consider an OEM-style spoiler from a trusted supplier. And while you are upgrading your exterior, perhaps it is time to ensure your car's performance matches its new look. Check out our guides on upgrading your Subaru radiator or diagnosing your suspension to keep your STI performing at its peak.
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