Grail Porsche 911 GT3/GT3 RS Cat Back Exhaust System (991.1)

The Grail stainless steel upgraded exhaust system for the 991.1 Porsche 911 GT3 and GT3 RS produces an incredible and unmistakeable sound. It's the sort of transformation that gives you goosebumps every time you start your engine.

The use of highly effective silencers enables maximum volume and wonderful engine sound. When the valves are closed, the exhaust gases flow through the rear backbox to allow the system to remain quiet for daily driving. When the valves are open, the rear backbox is completely bypassed for maximum noise!

Flow has been improved over the factory system due to a larger pipe diameter of 3 inches (76mm).

SPECIFICATION

- Hand-crafted in Germany from high-quality L304 stainless steel
- 76mm exhaust pipe diameter
- Street legal and registration-free thanks to optional ECE approval
- 2mm wall thickness
- Significant weight savings compared to the series
- Retains OEM Porsche valves
- Massively improved sound with the flap open and closed
- Set-up suitable for racetracks
- 100% handmade using the TIG welding process

PERFORMANCE GAINS

On the dyno, our 991.1 GT3 RS made the following performance gains with the non-ECE system:

Power: +10bhp
Torque: +13Nm

COMPATIBILITY

- Porsche 911 GT3 Coupe (991.1)
- Porsche 911 GT3 RS Coupe (991.1)

DOES NOT fit 991.2 generation vehicles.

Unless explicitly stated otherwise, all products sold by R44 Performance Limited are designated RACE ONLY and are solely for competition or off-road use limited to racing formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, may violate local, state, and Federal laws. R44 Performance Limited does not implicitly or explicitly confirm the legality of using any products it sells on public roads; that is entirely the responsibility of the consumer.

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We get a large number of custom orders and requests everyday, so as a result it is not always possible for us to keep every item in stock at all times in our warehouse. If you require the item urgently please contact our sales team here to check the stock before you make your purchase.

We totally understand if you're not certain a part will be compatible with your car, so we highly recommend contacting us here with your query. Our friendly sales team will then be in touch to confirm if this part is the correct part you are looking for.

All in stock products ship the same day if ordered before 2pm GMT

For out of stock items we will contact you with an estimated wait time if not otherwise specified above.

We offer worldwide shipping on all products. If upon receiving your product you wish to return; we offer a 30-day returns policy. For our in-depth returns information please follow the link. "R44 Returns Policy

All of our products come with a standard warranty of 1-3 years. This is dependant on the type of product however. For more details please see our warranty page here.