PORSCHE 991 GT3 RS EVENTURI INTAKE SYSTEM

Fitment: 991.1 and 991.2 GT3 RS

• Performance Gain: 8-11hp, 8-10ft-lb
• Flow Bench Data:
  • Stock Intake: 905 CFM
  • Eventuri Intake: 1025 CFM

The Porsche GT3 RS intake has been designed to offer a more efficient flow path to the engine in comparison to the OEM airbox. Utilising our Patented Venturi Housing concept, airflow can negotiate through the filters with a much less tortuous path thus reducing the drag of the system.

Furthermore, by increasing the overall volume in the intake, the maximum flow capacity has also been increased. Using bespoke filters with an outer diameter of 192mm or 7.5″ boasting a filtration surface area of over 110,000mm^2 each, we have made maximum use of the available space. Intake air temperatures have also been minimised by ensuring a sealed system and using carbon fibre which has a low thermal conductivity coefficient across the wall thickness. The resulting system provides genuine performance gains and a noticeable improvement in throttle response.

The Eventuri Difference

The 991 GT3 RS Eventuri system uses our Patented Carbon fibre Housings which provide an aerodynamically efficient airflow path from the filter to the engine. Not just another cone filter with a heat shield but a unique design that invokes the Venturi effect. You can read more about the housing design and how it works HERE

Flow Bench Testing

We conducted flow rate tests using a Superflow SF-1020 to measure the maximum flow rate possible at a pressure drop of 28” H2O. Tests were done on the same day in controlled conditions using the same test jig for each system. We tested our full intake system against the stock airbox system. The results show an increase in maximum flow by an additional 120 CFM over the OEM airbox. Importantly this has been achieved with a sealed intake system so the intake temperatures will also be maintained at a minimum.














Dyno Testing

Our RS3 Intake has been independently tested by ES Motors who build high powered Porsches in the UK. Tests were done on the same day back to back using a chassis dyno. As can be seen, there is a measurable gain throughout the RPM range, not just at peak which is more important as the increased area under the graph demonstrates that the intake is making an impact beyond the headline figures. This gain even on a stock car is noticeable on the road with better throttle response and quicker acceleration. The first graph is the summary of results and the second is a screenshot of the dyno test to show the gain in the mid-range.






Part Numbers:

• EVE-GT3RS-INT: Porsche 991.1 991.2 GT3 RS

The Eventuri 991 GT3 RS intake system consists of several components engineered to perform a specific purpose and fabricated to the highest of standards. We use 100% pre-preg carbon fibre with no fibreglass which means we can achieve a smooth internal surface to maintain smoother airflow. Here are the details for each component and the design ethos behind them:

Each intake system consists of:

• Carbon Fiber Double Venturi Filter Housing

• Bespoke High Flow Dry Cone Filters

• Carbon Fiber Inlet Ducts

• Silicon Coupler Internally Stepped

• Laser Cut Stainless Steel Brackets

PATENTED FILTER HOUSING



The 991 GT3 RS Filter Housing comprises 2 bespoke high flow filters, aluminium cowls, laser cut brackets and the carbon pod itself. The carbon pod shrouds the reverse mounted filters and smoothly shapes the airflow down to the throttle body. This smooth reduction in cross-sectional area invokes the Venturi effect where the airflow accelerates whilst maintaining laminar conditions. It can be thought of as a large velocity stack - below is a diagram to show the comparison between our patented design and a regular intake system. Further details can be read on the Technology page.







BESPOKE CONE FILTER

To achieve the highest flow rate possible, we designed a filter element to make as much use of the space available in the engine bay as possible. This new filter has an outside diameter of 192mm or 7.6" and when flow tested with housing using a 4" opening can flow up to 900 CFM at 28" H2O. The filter medium is ISO tested to ensure that filtration is in line with OEM standards and is also dry. The filter is constructed with our signature flow cones to aid in the Venturi housing principle.









CARBON DUCTS



The ducts channels ambient air from the side vents to the filter housing. To ensure a good seal against engine bay heat - they are secured to the filter housing at 3 points and use a neoprene gasket for an airtight seal. The ducts were designed to have the maximum internal volume possible within the given geometry of the engine bay. This ensures that the filter housing can draw with minimum restriction.





SILICON COUPLER



Our silicon coupler replaces the stock flexible tube to the throttle body. It matches the OEM throttle body with an internal step to ensure smooth flow.


The complete system comes together to provide an intake that improves on the stock airbox in performance, aesthetics and sound.

Euro Kustoms - Shipping, Returns & Refunds Policy

Last updated: 5 October 2025

Business Name: Euro Automotive Group Pty Ltd (trading as Euro Kustoms)
ABN: 98 629 757 035
Business Address: 8 Sir Joseph Banks Street, Botany NSW 2019, Australia
Email: info@eurokustoms.com.au
Phone: (+61) 451 513 339

1. Overview

Euro Kustoms supplies automotive parts and accessories and ships items Australia-wide via third-party courier services. This policy sets out our shipping practices, returns, refunds, warranties, and your rights under the Australian Consumer Law (ACL).

Due to the size, weight, or specialised nature of certain products, freight insurance is not always included. Unless additional insurance is arranged, goods are shipped at the buyer’s risk to the extent permitted by law.

2. Orders, Buyer Responsibilities & Transit Risk

• Buyers must provide accurate delivery details and a valid contact number at checkout.

• Items over 25kg or longer than 1 metre cannot be delivered to PO Boxes.

• Title and risk pass to the buyer upon dispatch, except where ACL applies.

• All items are inspected and packaged prior to dispatch.

• Euro Kustoms is not liable for loss or damage in transit unless additional freight insurance has been purchased.

• Optional freight insurance may be available and must be requested within 24 hours of purchase.

3. Stock Availability & Supply

• Stock availability is not guaranteed.

• Some products are custom-made, made-to-order, or imported.

• Estimated dispatch and delivery times are indicative only and may change without notice.

• Euro Kustoms is not responsible for delays caused by suppliers, manufacturers, importers, or couriers.

4. Dispatch & Delivery

• Orders are generally dispatched within 1–5 business days after payment clearance, unless otherwise stated.

• Delivery timeframes typically range from 7–10 business days, depending on location and courier.

• Tracking details are supplied for all shipments.

• Deliveries occur during standard business hours (weekdays only, excluding public holidays).

• Failed deliveries, incorrect addresses, or incomplete details may result in delays, returns, or redelivery fees.

5. Australian Consumer Law (ACL) Guarantees

Our goods come with guarantees that cannot be excluded under the ACL.

• For major failures, you are entitled to a refund, replacement, or repair.

• For minor failures, you are entitled to a repair or replacement.

• This policy does not limit or exclude any non-excludable rights under ACL.

6. Faulty Goods, Warranty & Damage Claims

• Claims must be lodged within 7 days of delivery, including order number and supporting evidence.

• Euro Kustoms may assess the product and/or liaise with the manufacturer or importer.

• Remedies may include repair, replacement, or refund (refunds are provided only where no other remedy is reasonably available).

Important conditions:

• Warranty may be void if the product has been modified, altered, incorrectly installed, or tampered with.

• Euro Kustoms is not liable for labour, diagnostic, fitting, or refitting costs.

• If customer actions contributed to the issue, remedies may be reduced or refused.

• Refunds for ACL-approved faults exclude shipping costs unless legally required.

• If a claim is rejected, the item will be returned at the customer’s cost.

• Storage fees of 10% of the item value per 14 days may apply after notification.

7. Change-of-Mind Returns (Discretionary)

• May be considered & determined at Euro Kustoms’ discretion within 7 days of delivery.

• Items must be unused, unfitted, and returned in original packaging & have a genuine reason for return.

• A 25% restocking fee applies.

• All return freight costs are the responsibility of the customer.

• Refunds are processed within 5–10 business days after inspection.

8. Order Cancellations

• Orders cancelled after placement but before dispatch or production incur a 25% restocking fee.

• Orders already dispatched are treated as returns.

9. Freight & Return Shipping Costs

• Shipping and handling fees are non-refundable.

• If free shipping was included, return freight is charged at 20% of the item value.

• Customers are responsible for ensuring returns are adequately packaged, insured, and traceable.

• Euro Kustoms is not responsible for items lost or damaged during return transit.

10. Non-Returnable & Excluded Items

Returns are not accepted for:

• Electrical items that have been installed or used.

• Custom-made, special-order, clearance, or discontinued items.

• Items marked “non-returnable”.

• Products damaged through misuse, incorrect installation, or unauthorised modification.

11. Returns Authorisation (RMA) Process

1. Email info@eurokustoms.com.au with:

   • Order number

   • Item(s) being returned

   • Reason for return (with photos where applicable)

2. Await written Return Authorisation (RMA) approval and instructions.

3. Clearly display the RMA number on the package.

4. Returns without an RMA will be refused.

12. Road-Use & Compliance Disclaimer

Unless expressly stated otherwise, products sold by Euro Kustoms are not certified for legal road use in Australia.

The customer is solely responsible for compliance with applicable laws and regulations. Euro Kustoms accepts no liability for damages or losses, penalties, defects, or enforcement actions arising from the use of non-compliant products.

13. Limitation of Liability

To the maximum extent permitted by law:

• Euro Kustoms excludes liability for indirect, incidental, or consequential loss, including loss of profit, loss of use, or business interruption.

• Liability for goods is limited, at Euro Kustoms’ discretion, to repair, replacement, or refund, except where Australian Consumer Law requires otherwise.

14. Force Majeure

Euro Kustoms is not liable for any delay or failure to perform its obligations where such delay or failure is caused by events beyond our reasonable control, including but not limited to supplier delays, manufacturing shortages, shipping congestion, port delays, customs clearance issues, industrial action, natural disasters, acts of government, or failures of courier or logistics providers.

15. Installation Responsibility

Unless expressly stated otherwise, products supplied by Euro Kustoms are intended to be installed by a suitably qualified professional.

Incorrect installation, failure to follow manufacturer instructions, or use outside the intended purpose may void any warranty and limit or exclude available remedies. Euro Kustoms accepts no responsibility for damage, faults, or losses arising from improper installation.

16. Governing Law & Jurisdiction

This policy and any disputes arising from it are governed by the laws of New South Wales, Australia. You agree that the courts of New South Wales have exclusive jurisdiction.

17. Contact Information

For all enquiries relating to shipping, returns, refunds, or warranties:

Email: info@eurokustoms.com.au
Phone: (+61) 451 513 339
Address: 8 Sir Joseph Banks Street, Botany NSW 2019, Australia