Grail Exhaust - Porsche 911 GT3 991.1 (ECE Approved)

QT Parts is a Finnish online store.

Our warehouse is located in Nokia, Finland.

You can collect your order directly from us if needed. Simply select “Pickup” at checkout.

Pay securely with multiple payment methods, including invoice and installment plans through Klarna.

The delivery time for products in stock is 1-5 business days. We ship worldwide.

If the product is not in stock and it is a pre order product, the average delivery time is 5-21 business days. If the product has a longer delivery time than previously announced, we will be in touch. International orders may be subject to VAT, import duties, and customs fees upon arrival in the destination country.

Terms for product returns:

• You must return the ordered products within 14 days of receiving
• The products must be unused and without damages
• Commission fee for handling returns is 21,90€
• For product returns, the customer is in charge of the return costs. Only door to door service (Express)
• Shipping costs are not refunded

For international orders sales are final and non-refundable. Once an order is placed, it cannot be canceled or returned. By placing an order, you acknowledge and agree to these terms.

Return address: QT Parts, Vasarakatu 8B, 37150 Nokia, Finland.

Pre order / made-to-order products

If the product you have ordered is a pre order or made-to-order item, it is not subject to the 14-day right of withdrawal or return under consumer protection laws, as the product is manufactured or sourced specifically based on the customer’s individual order.

If you wish to cancel your order before receiving the product, we will refund 50% of the total order amount.

This condition applies to the following product categories:

• Suspension
• Engine Tuning
• Engine Parts
• Exhaust Systems
• Fueling
• Turbochargers/superchargers
• Drivetrain
• ECE-approved Downpipes

All of the above products are manufactured or sourced individually based on the customer’s order, and therefore cannot be returned after delivery, unless the product has a manufacturing or material defect.

In the event of such a defect, the standard liability for defects as provided by consumer protection legislation shall apply.

Loud but Legal

GRAIL exhaust systems with ECE type approval can be used in EU vehicles without separate registration. Each system is handmade in Germany from high-quality L304 stainless steel. The result is a recognizable, intense soundscape that is felt from the very first start.

If you drive an imported vehicle with a type approval certificate, please check before purchasing whether the exhaust system requires an entry in the vehicle's registration data.

Loud – maximum volume

GRAIL offers maximum, yet completely legal sound.

Intelligent flap control allows for utilizing the engine's maximum permissible sound level. Thanks to effective silencers, a powerful and pure engine sound is achieved outside the test areas, as only in these areas do the flaps close and the rear silencer affects the exhaust gas flow.

This creates an authentic, unrestricted engine sound and maximum volume.

Quiet when needed – two cars in one

GRAIL is not just loud – it adapts to the situation.

Vehicle-specific designed silencers, developed in GRAIL's sound laboratory, combined with durable flaps, ensure:

• Maximum sound with open flaps

• Effective sound attenuation with closed flaps

When driving in test areas, the system remains at the noise level of the original exhaust system. Thanks to high-quality materials and design, the difference between the quiet and loud modes is exceptionally clear.

Flow-optimized design

The GRAIL exhaust system is designed to minimize resistance in the exhaust gas flow. A larger pipe diameter and fewer constrictions significantly improve flow compared to the standard system.

The result is a freer-breathing engine without unnecessary restrictions.

Robust construction and precision

Stainless steel flaps made from CNC-machined solid material operate within model-specific defined measurement ranges. This allows for an optimal combination of:

• Lower back pressure

• Maximum volume

• Pure engine sound

Quality Made in Germany

GRAIL offers what is expected from a high-performance exhaust system:

• First-class workmanship

• Top-notch materials

• Maximum, vehicle-optimized soundscape

The perfect choice for the driver who wants to get both performance and a pure, mechanical sound from their Porsche 911 GT3 (991.1) – without compromise.