Mirco GT 3D Seats Fitted Into a Subaru Impreza GRB – A Customer Showcase
At GSM Performance, we love seeing how our customers bring their seat upgrades to life—and this recent installation is a perfect example of smart choices, solid hardware, and great taste all coming together in one build. One of our customers recently installed a pair of Mirco GT 3D FIA-approved bucket seats into their Subaru Impreza GRB, using the M2 Motorsport 3-in-1 direct-fit frame kit built specifically for this generation of Subaru. The end result? A properly motorsport-inspired interior that looks sharp and performs just as well.
This install highlights the importance of pairing the right seat with the right fitting hardware. The Mirco GT’s compact design makes it ideal for cars like the GRB with moderate interior space, and the M2 frame kit ensured a straightforward, secure install into the OEM mounting points. With everything bolted in place, the new interior looks ready for both spirited road use and serious track work. We’ve received photos directly from the customer showcasing the final fitment, and we couldn’t wait to share the results.
The Car: Subaru Impreza GRB (2007–2014)
The GRB chassis marks the third generation of the Subaru Impreza and was the first to bring the WRX STi hatchback body style to the global stage. Known for its rally-inspired DNA, symmetrical AWD, and turbocharged flat-four engine, the GRB makes for a fantastic platform for tuning and motorsport use. With that in mind, a proper set of FIA-approved bucket seats takes the driving experience to the next level—offering increased support, better control, and a much more connected feel behind the wheel.
The Bucket Seat: Mirco GT 3D Motorsport Seat
The Mirco GT 3D is one of our favourite picks when a customer needs a slim-profile FIA-approved seat that doesn’t compromise on comfort or support. This seat is particularly well-suited for narrow cockpits or builds where side clearance is tight, like the Subaru GRB. This installation is finished in 3D spacer fabric, which not only looks fantastic but also helps improve airflow for longer stints on track or the road.
We stock and display the Mirco GT in this trim and colour option at our showroom, ready for viewing and testing in-store for the 2025 racing season.Â
Key Features of the Mirco GT 3D:
- FIA 8855-1999 approved for full motorsport use
- Constructed with a strong, lightweight fibreglass shell
- Trimmed in breathable 3D spacer fabric (other trim options available)
- Side-mounted with support for 5- and 6-point harnesses
- Large harness slots for use with HANS devices
- High-side bolsters for enhanced lateral support
- Ideal for competitive motorsport, track days, and high-performance builds
- Approximate weight: 9.4kg
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Seat Fitment and Dimensions
The Mirco GT 3D has a compact footprint, which makes it a brilliant option for fitting into cars like the GRB that have limited seat width between the centre tunnel and door card.
Key Dimensions:
- Shoulder width: 590mm
- Base width: 495mm
- Suitable for drivers up to a 36-inch waist
- Designed for a snug fit and great support without overwhelming smaller interiors
This slim-line construction keeps the seating position low and tight, giving the driver a confident and connected feel, whether on the road or at the track.
Installation: M2 Motorsport 3-in-1 Frames for the GRB
Getting the right fit is just as important as picking the right seat, and that’s where M2 Motorsport’s GRB-specific fitting frames come in. These kits are built for direct fitment into the Subaru Impreza GRB chassis, aligning perfectly with the OEM floor mounting points. That means no guesswork, no welding, no stress.
The kit is a 3-in-1 setup, including:
- Vehicle-specific subframes
- Sliding runner kit with 200mm of adjustment
- Side mounts to attach the bucket seat to the frame
This makes the system fully adjustable, allowing the driver to fine-tune their seating position for both comfort and control. The sliding mechanism is also a big win for cars that share driving duties or need quick setup changes between road and track.
More Fitting Frame Options for Other Vehicles
While this setup was designed for the Subaru GRB, we have a wide range of M2 Motorsport frames available for other makes and models. Whether you drive a hot hatch, coupe, or saloon, chances are we’ve got a plug-and-play solution to get your bucket seats securely mounted. These brackets use the original bolting points and allow you to fit your M2 Motorsport seat with very little hassle. These brackets are a must-have if your vehicle is listed. They also set the seat at an ultra-low level, providing the perfect driving experience.
More Versions of the Mirco GT Seat Available
The Mirco GT isn’t limited to just the 3D version seen in this install. We stock multiple versions with different trim materials and finishes to suit all build styles and budgets. These include:
- Soft-touch velour fabric – Comfortable and road-friendly
- 3D Spacer fabric – For enhanced breathability
- Vinyl – Durable and easy to clean
- Classic vinyl and suede split trim – A vintage motorsport look with modern features
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Final Thoughts – A Subaru Interior Built for Drivers
This GRB build is a perfect showcase of what can be achieved when great components come together. The Mirco GT 3D seats provide that locked-in, race-ready feel, while the M2 Motorsport fitting frames ensure perfect alignment and adjustability. We’re always excited to see these kinds of builds come to life—especially when the finished result looks this good.
If you’re thinking about upgrading the seats in your own GRB or any other performance vehicle, we’re here to help guide you through the best options for fitment, comfort, and compliance. Drop us a message, or better yet, pop into our showroom and try a few seats out in person.