• RM Engineering two-piece GT4+ RS carbon fiber roof fin for the Toyota GR Supra A90 and A91
  • Top-view CFD visualization showing the GT4+ RS Roof Fin along the Toyota GR Supra roof centerline
  • Two-piece carbon fiber roof fin installed along the centerline of a Toyota GR Supra
  • Two pre-preg carbon fiber sections included with the Toyota GR Supra GT4+ RS Roof Fin
  • Toyota GR Supra with GT4+ RS centerline roof fin and 1600 mm carbon fiber rear wing
  • CFD visualization of airflow over the Toyota GR Supra GT4+ RS Roof Fin toward the rear wing
  • Side detail of the GT4+ RS carbon fiber roof fin installed on a Toyota GR Supra
  • Side view of a Toyota GR Supra showing the GT4+ RS Roof Fin and rear wing configuration
  • Rear section of the carbon fiber roof fin installed above the Toyota GR Supra rear glass
  • Top view showing both GT4+ RS carbon fiber roof fin sections aligned along the Supra centerline
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RM ENGINEERING RACE

RM Engineering GT4+ RS Roof Fin For TOYOTA A90 SUPRA

RM Engineering GT4+ RS Roof Fin For TOYOTA A90 SUPRA

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£299.00 GBP
£299.00 GBP
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WARRANTY POLICY

Warranty & Inspection Policy

All products must be carefully inspected within seven (7) calendar days of delivery.

Any claim involving damage, defects, missing parts, or incorrect items must be submitted within this seven-day inspection period. Claims made more than seven days after delivery will not be eligible for warranty coverage, replacement, return, or refund.

Customers are responsible for inspecting the product and confirming that it is correct, complete, undamaged, and suitable for the intended vehicle before installation.

Products must not be installed if any damage, defect, fitment issue, or missing component is discovered. Please contact us before proceeding with installation.

Once a product has been installed on a vehicle, it is considered accepted by the customer and is no longer eligible for warranty coverage, return, replacement, or refund.

By purchasing and installing our products, the customer acknowledges and agrees to this Warranty & Inspection Policy.

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GT4+ RS Roof Fin Overview

The RM Engineering GT4+ RS Carbon Fiber Roof Fin is a two-piece centerline aero fin for the Toyota GR Supra A90 and A91. Constructed from pre-preg carbon fiber, it follows the roof and rear glass to help organize airflow approaching the rear wing.

Inspired by the centerline fin concept used on the Porsche 992 GT3 RS, it was developed as part of the Supra GT4+ EVO rear aero configuration rather than as a decorative roof accessory.

Centerline Airflow Management

During cornering or in crosswinds, airflow can move laterally across the roof and change the direction of the air approaching the rear wing. The GT4+ RS Roof Fin is positioned along the Supra’s centerline to limit this crossflow and support more consistent airflow toward the wing under yaw.

The highlighted centerline region in the CFD image below shows the Roof Fin’s location between the roof and rear wing.

CFD top view showing the Toyota GR Supra A90 A91 GT4+ RS Roof Fin along the roof centerline
Top-view CFD visualization showing the Roof Fin’s centerline position and airflow approaching the rear wing.

CFD Evaluation

The Roof Fin was evaluated within the complete GT4+ EVO aerodynamic package. The CFD visualization below shows flow structures over the roof and rear glass with the Roof Fin positioned upstream of the rear wing.

CFD airflow visualization around the Toyota GR Supra A90 A91 GT4+ RS Roof Fin and rear wing
CFD visualization of airflow over the Supra roof, around the centerline Roof Fin and toward the rear wing.

Because the simulation includes the complete rear aero configuration, the resulting airflow changes and performance figures should not be attributed to the Roof Fin alone. Its isolated contribution would require dedicated yaw-angle CFD or track correlation.

The Roof Fin is designed to complement the Toyota GR Supra A90/A91 GT4+ 1600 mm Rear Wing. Additional methodology and complete-package results are available in the GT4+ Base vs. EVO CFD analysis.

Product Features

  • Two-piece, vehicle-specific centerline roof fin
  • Designed for the Toyota GR Supra A90/A91
  • Pre-preg carbon fiber construction
  • Follows the roof and rear-glass centerline
  • Helps organize airflow approaching the rear wing
  • Developed as part of the GT4+ EVO aero package
  • Porsche 992 GT3 RS-inspired centerline concept

Vehicle Fitment

Designed for:

  • Toyota GR Supra A90
  • Toyota GR Supra A91

Confirm the roof surface and intended mounting positions before installation. Compatibility with roof wraps, coatings, antennas or other roof-mounted accessories should be checked before ordering.

Browse the complete Toyota GR Supra A90/A91 aerodynamic collection.

Installation

Precise centerline placement is required to align the two Roof Fin sections across the roof and rear-glass area.

Test-fit both components and confirm their spacing, orientation and alignment before permanently securing them. Professional installation is recommended.

Product Questions

What is the purpose of the GT4+ RS Roof Fin?

The GT4+ RS Roof Fin follows the centerline of the Supra’s roof and rear glass to help organize airflow approaching the rear wing. Its intended purpose is to limit lateral airflow movement and support more consistent approach flow under yaw, such as during cornering or crosswinds.

Does the Roof Fin fit both the A90 and A91 Toyota GR Supra?

Yes. It is designed for Toyota GR Supra A90 and A91 models. Confirm the roof surface and compatibility with any wraps, coatings, antennas or other roof-mounted accessories before installation.

Is this an antenna cover or roof spoiler?

No. It is a centerline aerodynamic roof fin rather than a shark-fin antenna cover or roof spoiler. It does not replace the factory antenna or generate rear load in the same way as a rear wing.

How many components are included?

The GT4+ RS Roof Fin is a two-piece system constructed from pre-preg carbon fiber. The vehicle-specific sections align along the center of the Supra’s roof and rear-glass area.

Can the Roof Fin be installed without the GT4+ Rear Wing?

Yes, it can be installed separately. However, its aerodynamic purpose is to organize airflow approaching a rear wing, and it was developed to complement the Toyota GR Supra A90/A91 GT4+ 1600 mm Rear Wing.

Was the Roof Fin evaluated using CFD?

Yes. It was evaluated within the complete GT4+ EVO aerodynamic package. The CFD visualizations show its centerline position within the airflow traveling over the roof and toward the rear wing, but the Roof Fin’s individual aerodynamic contribution was not isolated.