The Toyota GR Supra A90/A91 is one of the best modern sports cars to modify—but it is also surprisingly easy to go too far and turn it into a boy racer.
With its aggressive factory proportions, wide rear haunches, sculpted bodywork, and distinctive lighting, the MK5 Supra already looks like a purpose-built performance car. The best modifications aren't necessarily the biggest ones. For many Supra owners, the goal is to make the car look sharper, more aggressive, and more personalized while still maintaining the design language Toyota intended.
That's where the OEM+ approach comes in.
OEM+ modifications enhance what the factory already gave you instead of completely replacing it. The result is a Supra that looks like it could have come this way from the factory—just a little more special.
If you own a 2019–2026 Toyota GR Supra A90 or A91, these are some of the best OEM+ upgrades and modifications to consider.
What Does OEM+ Mean?
OEM+ stands for "Original Equipment Manufacturer Plus."
In simple terms, an OEM+ modification improves the appearance, functionality, or performance of a vehicle while maintaining a factory-inspired look.
For the GR Supra, that means avoiding oversized wings, excessive body kits, and modifications that fight against the car's original styling. Instead, the best upgrades work with the factory design.
Think:
- Subtle aero instead of an oversized body kit
- Better wheels and tires while maintaining the Supra's proportions
- Improved stance without sacrificing drivability
- Functional-looking vents and aero details
- Upgraded lighting that complements the factory design
- Exhaust upgrades that improve sound without making the car obnoxious
- Interior details that feel like they belong in the car
- Performance modifications that enhance the driving experience without compromising reliability
The goal is simple: make the Supra better without making it look like a completely different car.
1. Upgrade the Factory Aero
One of the easiest ways to improve the appearance of an A90/A91 Supra is to build on the factory aero.
The Supra already comes with substantial factory lower-body styling, including the front lip, side skirts, and rear diffuser. Rather than replacing these pieces with a completely different body kit, adding subtle extensions can create a more aggressive appearance while retaining the original design.
OEM+ Designs Ground Effects Kit
The OEM+ Designs Ground Effects Kit for the GR Supra A90/A91 is designed specifically around this idea.
Instead of replacing the factory components, the eight-piece kit extends them with additional front lip, side skirt, and rear diffuser pieces. The result is a more aggressive lower-body profile while retaining the factory Supra styling.
The kit uses injection-molded PP construction and a satin-black finish designed to closely complement the factory trim. It also uses double-sided adhesive rather than requiring drilling into the vehicle, meaning it's completely reversible.
Why we like it: It's one of the best choices for an owner who wants a noticeably more aggressive Supra without jumping straight into a traditional aftermarket body kit.
2. Add a Front Splitter
If you want to keep things simple, a front splitter is one of the highest-impact modifications you can make.
A good splitter visually lowers the front of the Supra and gives the factory bumper more definition without dramatically changing its shape.
OEM+ Designs Front Splitter
The OEM+ Designs Front Splitter for the GR Supra A90/A91 was designed to complement the factory front lip rather than replace the Supra's original styling.
It features injection-molded ABS construction, a satin-black finish, and installs using factory hardware plus adhesive. No drilling is required.
For owners who want a subtle front-end upgrade, this is one of the easiest places to start.
Best for: A clean, understated OEM+ build.
4. Open Up the Factory Hood Vents
One of the most interesting OEM+ modifications for the MK5 Supra involves the factory hood vents.
From the factory, the Supra's hood vents are styled to look aggressive, but they are closed off. Replacing them with an open mesh design gives the hood a more functional appearance while preserving the original shape.
OEM+ Designs Open Hood Vents
The OEM+ Designs Open Hood Vents replace the factory closed-off pieces with injection-molded vents featuring a honeycomb open-mesh design.
They are available in satin black or gloss black and use factory-style clips for installation.
It's a relatively small modification, but one that makes a surprisingly noticeable difference when viewed up close.
Best for: Owners who want a subtle detail that makes the Supra look more performance-focused.
5. Open the Front Bumper Vents
The same OEM+ philosophy can be applied to the front bumper.
The factory Supra has several areas that are designed with the appearance of functional airflow in mind. Opening these areas up can give the front end a more purposeful motorsport-inspired appearance without resorting to an aggressive aftermarket bumper.
OEM+ Designs offers Open Front Bumper Vents with an open mesh design intended to replace the factory closed-off/fake vent appearance. The product is part of the company's growing range of Supra-specific OEM+ exterior upgrades.
This is a particularly good modification when paired with the open hood vents.
[Shop the Open Front Bumper Vents]
6. Upgrade the Rear Diffuser
The rear of the A90/A91 Supra is another area where small changes can make a big difference.
The factory diffuser already has a strong design, so replacing the entire component isn't always necessary. Adding carefully designed diffuser fins can give the rear bumper additional depth while preserving the original diffuser.
OEM+ Designs Rear Diffuser Fins
OEM+ Designs also offers Diffuser Fins for the GR Supra, providing another simple way to add visual detail to the factory rear diffuser. The fins are designed as a relatively subtle modification for owners who don't want an overly aggressive rear end.
7. Upgrade the Tail Lights
Lighting is one of the easiest ways to change the personality of a car.
The MK5 Supra's factory tail lights are already distinctive, but there are several ways to customize the rear of the car while retaining its overall character.
Clear Tail Light Lenses
For owners who want a cleaner or more customized appearance, OEM+ Designs Clear Tail Light Lenses replace the factory outer lens while retaining the original lighting assembly.
It's a particularly interesting option for builds where the owner wants to move away from the traditional red tail-light appearance without replacing the entire assembly.
[Shop the Clear Tail Light Lens]
LC-Inspired Tail Lights
For a much more dramatic lighting upgrade, OEM+ Designs also offers LC Tail Lights for the GR Supra A90/A91, inspired by the Lexus LC500's distinctive rear lighting design.
This is one of the more noticeable modifications in the OEM+ Designs Supra lineup, so it's best suited to owners who want their car to stand out while still using a design language inspired by Toyota/Lexus.
[Shop the LC Style Tail Lights]
9. Improve the Wheels and Tires
No Supra build is complete without talking about wheels and tires.
The factory wheels are a good starting point, but wheels are one of the most effective ways to change the stance and personality of the A90/A91.
For an OEM+ build, avoid going excessively large or choosing a wheel design that overwhelms the car.
Instead, look for:
- A lightweight wheel
- A width appropriate for the Supra
- A fitment that maintains proper suspension geometry
- A design that complements the factory bodywork
- High-performance tires appropriate for how you drive
- A finish that works with your Supra's paint color
A well-chosen wheel and tire package can make a Supra look substantially lower and wider without actually changing the bodywork.
10. Improve the Suspension and Stance
The next step after wheels and tires is suspension.
For a street-driven Supra, the best OEM+ suspension setup isn't necessarily the lowest one.
A modest drop can improve the relationship between the tires and wheel arches, while upgraded springs, dampers, or coilovers can improve both handling and appearance.
The key is maintaining enough suspension travel and ground clearance for real-world driving.
An OEM+ Supra should still be enjoyable to drive every day.
11. Upgrade the Exhaust
The B58-powered Supra has one of the best modern six-cylinder exhaust notes, but an exhaust upgrade can make the car considerably more entertaining.
There are several directions you can take:
- Cat-back exhaust
- Axle-back exhaust
- Midpipe
- Exhaust tips
- Valve-controlled systems
For an OEM+ build, the goal should be improved sound and appearance without excessive drone or an unnecessarily loud exhaust.
OEM+ Designs Exhaust Cover
If you've modified your exhaust to a single exit system or have unused factory exhaust openings due to fully removing the system for weight savings, the OEM+ Designs Exhaust Cover for the GR Supra A90/A91 provides a simple way to clean up the rear bumper.
It's designed as a block-off cover for owners running a single-exit exhaust configuration, helping create a cleaner finished appearance.
It's a perfect example of an OEM+ modification: small, purposeful, and designed around the factory bodywork.
12. Add Subtle Front-End Details
Sometimes the smallest modifications make the biggest difference.
OEM+ Designs Front Bumper Canards
The OEM+ Designs Front Bumper Canards add a small amount of visual aggression to the front bumper without transforming the Supra into a full race-inspired build.
They're best used as a finishing touch alongside other subtle aero modifications rather than as the centerpiece of the build.
For example, a front splitter + canards + factory wheels can create a much more aggressive-looking front end without needing a completely different bumper.
[Shop the Front Bumper Canards]
13. Don't Forget the Interior
OEM+ isn't only about exterior modifications.
Small interior details can make the Supra feel more personalized without compromising the factory cabin.
Consider upgrades such as:
- Premium floor mats
- Interior trim pieces
- Cup-holder covers
- Carbon-fiber accents
- Shift paddles
- Steering-wheel upgrades
- Additional storage solutions
The best interior modifications are the ones you notice every time you get in the car—but don't immediately scream "aftermarket."
14. Consider a Mild Performance Tune
If appearance isn't your only priority, the B58 engine gives the Supra an enormous amount of tuning potential.
A conservative ECU tune can significantly change the character of the car, particularly when combined with supporting modifications.
Before tuning, consider the complete setup:
- ECU calibration
- Intake
- Charge pipe
- Intercooling
- Exhaust
- Fuel requirements
- Transmission calibration
- Cooling
- Maintenance
For a street car, a conservative and well-developed tune is usually preferable to chasing the biggest dyno number possible.
The best OEM+ performance build should feel faster, sharper, and more refined—not simply louder or harder to drive.
15. Upgrade the Brakes
More power and grip eventually create a need for better braking performance.
Depending on your goals, brake upgrades can range from simple pad and fluid upgrades to complete big-brake kits.
For a street-driven Supra, high-quality brake pads, fresh high-temperature fluid, and good tires can make a significant difference before moving to a complete brake system.
If your Supra sees track use, brake cooling and pad selection become particularly important.
Why OEM+ Is the Right Approach for the GR Supra
The A90/A91 Supra doesn't need much help looking aggressive.
That's what makes OEM+ modifications so effective.
Instead of covering up Toyota's original design with an oversized body kit, the best upgrades simply emphasize what is already there. A splitter makes the factory front end look lower. Side skirt extensions give the profile more presence. Open vents make the car look more functional. Lighting upgrades change the personality of the rear end. Wheels and suspension improve the stance.
Each modification can stand on its own, but together they create a cohesive build.
That's the essence of OEM+.
Modify the Supra. Don't redesign it.
Shop OEM+ GR Supra Parts
OEM+ Designs specializes in OEM+ modifications for the Toyota GR Supra A90/A91, with products designed around the philosophy of "How it should have come from the factory."
From aero and vents to lighting and smaller finishing touches, the goal is to make your Supra look like a more refined version of itself—not like a completely different car.
Explore the OEM+ Designs GR Supra collection and start building your A90/A91: