• RM Engineering GT4+ pre-preg carbon fiber hood vent for the Toyota GR Supra A90 and A91
  • Top-view CFD streamlines passing across the GT4+ hood vent on a Toyota GR Supra
  • Carbon fiber GT4+ heat-extraction hood vent installed on a Toyota GR Supra A90
  • Full-vehicle CFD airflow visualization around the GT4+ hood vent on a Toyota GR Supra
  • Engineering visualization showing the GT4+ splitter lit and hood vent position on a Toyota GR Supra A90
  • Close-up of the pre-preg carbon fiber construction and recessed outlet on the Supra GT4+ hood vent
  • Top-view CAD rendering of the Toyota GR Supra GT4+ hood vent and four-piece front canards
  • Toyota GR Supra GT4+ splitter kit, hood vent shown with the front splitter and four-piece canard system
  • Front CAD rendering of a Toyota GR Supra A90 with GT4+ hood vent, splitter and four-piece canards
  • CFD surface-relative velocity field around the recessed GT4+ hood vent outlet
  • GT4+ carbon fiber hood vent installed on a track-prepared Toyota GR Supra A90
  • Top-view CAD rendering of the recessed extraction opening on the Toyota Supra GT4+ hood vent
  • Cross-section showing the upstream Gurney flap and recessed outlet of the Supra GT4+ hood vent
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RM ENGINEERING RACE

RM Engineering GT4+ Hood Vent For TOYOTA A90 SUPRA

RM Engineering GT4+ Hood Vent For TOYOTA A90 SUPRA

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£322.00 GBP
£322.00 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+ Hood Vent Overview

The RM Engineering GT4+ Carbon Fiber Hood Vent is a recessed heat-extraction vent developed for the Toyota GR Supra A90 and A91. Constructed from pre-preg dry carbon fiber, it combines an enlarged extraction opening with an upstream Gurney flap to help release hot, high-pressure air from the engine bay.

Unlike a surface-mounted styling vent, the GT4+ design creates a functional opening through the hood and positions the outlet within the external airflow passing over the vehicle.

Recessed Extraction Geometry

The upstream Gurney flap is designed to initiate local airflow separation before the extraction opening. Behind it, the recessed outlet sits below the external shear layer, helping protect the opening from direct stagnation pressure.

This pressure relationship is intended to encourage heated engine-bay air to move through the hood opening and into the lower-pressure external flow.

Cross-section of the upstream Gurney flap and recessed outlet on the Toyota Supra GT4+ hood vent
Cross-section of the upstream Gurney flap and recessed extraction outlet.
Top-view engineering visualization of the Toyota Supra GT4+ hood vent extraction opening
Top view of the enlarged hood extraction opening.

CFD-Developed Airflow Strategy

The hood vent geometry was evaluated through full-vehicle CFD analysis on the Toyota GR Supra A90/A91 platform. The simulations were used to examine surface pressure, relative velocity and streamline behavior around the recessed outlet.

Full-vehicle CFD streamlines passing over the GT4+ hood vent on a Toyota GR Supra A90
Full-vehicle streamlines approaching and passing over the hood vent.
Top-down CFD airflow visualization across the Toyota Supra GT4+ hood vent and roof
Top-down airflow path across the hood and roof.

Surface-relative velocity visualization shows faster airflow passing above and around the outlet, with a lower-speed separated region inside the recessed cavity. This behavior is consistent with an external shear layer forming over the opening rather than airflow directly stagnating inside it.

CFD surface-relative velocity visualization around the Toyota Supra GT4+ recessed hood vent
Surface-relative velocity around the recessed hood outlet.
Near-surface CFD streamlines continuing downstream from the Toyota Supra GT4+ hood vent
Near-surface streamlines continuing downstream from the vent.

The CFD results support the intended external-flow mechanism of the vent. They do not independently quantify engine-bay mass flow, temperature reduction or a specific change in front-end lift.

Read the complete Toyota GR Supra GT4+ Base vs. EVO CFD analysis for additional development context.

Product Features

  • Vehicle-specific design for the Toyota GR Supra A90/A91
  • Pre-preg dry carbon fiber construction
  • Enlarged recessed extraction opening
  • Integrated upstream Gurney flap
  • CFD-developed external airflow geometry
  • Designed to support engine-bay heat and pressure extraction
  • Gloss carbon fiber finish

Vehicle Fitment

Designed for:

  • Toyota GR Supra A90
  • Toyota GR Supra A91

Confirm the hood configuration and available underhood clearance before installation. Fitment with aftermarket hoods or modified engine-bay components is not confirmed.

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

Installation Requirements

Professional installation is required. The factory hood must be measured and cut to create the functional extraction opening before the carbon fiber vent is secured in position.

Test-fit the component and confirm its alignment, opening location and underhood clearance before permanently modifying the hood. Installation permanently modifies the factory hood.

Product Questions

How does the GT4+ hood vent extract heat from the engine bay?

The vent creates a functional opening between the engine bay and the airflow above the hood. Its upstream Gurney flap encourages local flow separation, while the recessed outlet sits beneath the resulting shear layer. This arrangement is designed to create a lower-pressure extraction region that helps hot, high-pressure engine-bay air exit through the hood.

How is the GT4+ hood vent different from a surface-mounted styling vent?

A surface-mounted styling vent may change only the hood’s appearance. The GT4+ hood vent requires a functional opening and uses a recessed extraction outlet, an upstream Gurney flap and vehicle-specific geometry developed around the Toyota GR Supra A90/A91 hood.

What did the CFD analysis show around the hood vent?

Full-vehicle CFD visualization showed faster external airflow passing above and around the recessed outlet, with a lower-speed separated region inside the cavity. Near-surface streamlines continued downstream from the vent, supporting its intended heat-extraction airflow mechanism.

Does installation require cutting the factory hood?

Yes. A functional extraction opening must be measured and cut into the hood before the vent is secured. Installation permanently modifies the hood, so professional installation is required to confirm alignment and underhood clearance before cutting or drilling.

Will the GT4+ hood vent fit an aftermarket carbon fiber hood?

Fitment with aftermarket hoods is not confirmed. Differences in hood shape, material thickness, internal reinforcement and underhood clearance may affect installation. Inspect and measure the intended mounting area before ordering.