The Ultimate 2016 wrx sti rear seat swap Guide: DIY Folding Seat Conversion

Introduction: Why This Mod is Worth It

For owners of the 2015+ Subaru WRX, the fixed rear seatback can feel like a significant limitation. Unlike the WRX STI or other models like the Legacy and Outback, the standard WRX lacks a ski pass-through or folding functionality. This means transporting longer items like skis, lumber, or even large packages becomes a frustrating game of Tetris. The desire for both functional improvement and that coveted OEM+ aesthetic is what drives this popular diy wrx interior mod.

This 2016 wrx sti rear seat swap guide is designed for the value-conscious enthusiast who isn't afraid to get their hands dirty. The transformation isn't just about looks; it's about unlocking the full potential of your vehicle's interior. The STI rear seatback upgrade provides a factory-like finish that looks like it came from the dealership, all while adding tremendous utility.

Part Compatibility: Are WRX and STI Rear Seats Interchangeable?

This is the most critical question to answer before you begin. The good news is that for 2015+ sedan models, the STI rear seat swap is remarkably straightforward. Unlike the complex modifications required for wagon models (where the GG chassis wagon is narrower than the GD chassis STI sedan ), the VA chassis WRX and STI sedans share the same basic dimensions.

This direct compatibility makes the 2016 wrx sti rear seat swap one of the most rewarding and hassle-free interior upgrades. You are essentially performing a direct replacement, not a fabrication-heavy modification.

Sourcing Your STI Rear Seats: Junkyard Finds and Part Numbers

Finding the right parts is an adventure in itself. The best places to look are:

• Junkyards/Pull-Your-Part Lots: A fantastic source for affordable parts. Call around to local yards and ask if they have any wrecked 2015+ STIs. This is your chance for a junkyard sti seat find.
• Online Marketplaces: eBay, Facebook Marketplace, and Subaru enthusiast forums (like NASIOC) often have part-outs. A recent eBay listing showed a used 2015-2017 WRX rear seatback for around $100 .
• Subaru OEM Parts Dealers: For a brand-new unit, you can order directly from Subaru. The Subaru seat back protector (Part Number: J501SVC110) is a related accessory that fits 2022-2025 WRX models , but for the seatbacks themselves, you'll need to search by VIN or vehicle year.

While specific part numbers can vary by year and trim, sourcing from a 2015-2017 STI will guarantee compatibility with your 2015+ WRX. When you find a set, inspect them thoroughly for any damage, stains, or wear on the upholstery and brackets.

Essential Tools and Preparation

You won't need a full mechanic's shop for this job. The tool list is modest, making this a very accessible diy wrx interior mod.

Before you start, clear a clean, spacious area in your garage or driveway. It's also wise to have a blanket or cardboard to place the seats on once they're removed to protect them from dirt and damage.

Step-by-Step Removal of Stock WRX Seats

The process of 2015 wrx rear seat removal is simple and should take less than an hour.

Step 1: Remove the Lower Seat Cushion

The lower cushion is held in place by two robust clips at the front base. There are no bolts. Firmly grasp the front of the cushion and pull straight upward with even force. It will release from the clips with a noticeable pop. Once free, you can lift it out of the car and set it aside.

Step 2: Remove the Plastic Side Trims

With the lower cushion out, you'll see plastic trim panels on the sides of the seatback. These are held in by clips. Carefully use your trim removal tool to pry them loose. Start from the bottom and work your way up, being gentle to avoid breaking the clips.

Step 3: Unbolt the Upper Seatbacks

The fixed seatbacks are held in by several bolts:

• Two bolts at the very bottom of each seatback (60% and 40% sections).
• Additional bolts or nuts may be hidden behind the plastic side trims you just removed.
• Some models may have a bolt near the top of the seatback, accessed from the trunk.

Use your socket set to remove all these fasteners. It's helpful to have a small bag or container to keep them organized. Once all bolts are removed, the entire seatback assembly can be lifted out of the vehicle.

Step-by-Step Installation of STI Seatbacks

This is the rewarding part. The wrx sti rear seat install is essentially the reverse of the removal process.

Step 1: Position the New STI Seatbacks

Carefully maneuver the STI seatback into place. It will have the integrated ski pass-through door. Align the mounting points on the seatbacks with the corresponding holes in the car's body.

Step 2: Secure with Bolts

Hand-tighten all the bolts you previously removed to hold the seatback in place. Once all are started, use your socket set to tighten them securely. Do not over-torque, as you could strip the threads.

Step 3: Reattach Trim Panels and Lower Cushion

Snap the plastic side trims back into place. Ensure all clips are fully engaged. Finally, align the front of the lower seat cushion with the two clips on the body and push down firmly until you hear it click into place.

Step 4: Test Functionality

This is a crucial step. Test the folding mechanism for both the 60 and 40 sections. Ensure they latch securely when returned to the upright position. Open and close the ski pass-through door to ensure it operates smoothly. Test the seat belts to ensure they retract properly and aren't pinched.

Safety Considerations and Final Checks

Since you are modifying a part of the interior safety system, due diligence is required.

• Secure Mounting: Double-check that every bolt is tightened to the proper specification. A loose seatback can become a projectile in a collision.
• Latch Integrity: The seatbacks must latch firmly into the upright position. Have a helper push and pull on the seated area to check for any excessive movement.
• Seat Belt Function: Ensure all seat belts are not twisted and retract fully and smoothly.
• No Interferences: Verify that no wiring or harnesses were pinched during the installation process.

As noted in other modification guides, "Modified seat brackets represent a potential point of failure in a collision" . While this specific sedan swap uses unmodified OEM parts, the warning underscores the importance of a meticulous and safe installation.

Benefits and Functional Improvements

Once completed, the benefits of this wrx folding seat conversion are immediately apparent:

• Cargo Versatility: Suddenly, transporting long, narrow items like skis, snowboards, or Ikea furniture is simple and clean through the ski pass-through.
• Increased Storage Space: Fold down a section of the seat for larger cargo while still retaining seating for one or two passengers.
• OEM Aesthetic: The interior gains a more premium, functional look that matches higher-trim models.
• Resale Value: Adding desirable OEM functionality can make your car more attractive to potential buyers in the future.