Stone Exhaust Cat-Back Valvetronic Exhaust System for Porsche 971 Panamera 4S 2.9T 440 PS
Upgrade your Porsche Panamera 4S 971 2.9T with a premium cat-back valved exhaust. The Stone Exhaust Valvetronic Cat-Back Exhaust System delivers a switchable, remote-controlled performance exhaust with true OEM fitment, deeper sound, and everyday refinement. Developed using 3D scanning and reverse engineering, this Porsche 971 Panamera 4S catback exhaust is engineered for precision, durability and performance. Perfect for owners searching for Porsche Panamera 4S exhaust, Porsche 971 cat-back exhaust, switchable valved exhaust, and OPF compatible exhaust in the UK.
We run Stone systems on our own cars and customer builds. Fitment is spot on, the weld quality is exceptional, and our customers consistently praise the sound and comfort with valves closed and the aggressive tone with valves open.
Why choose this Porsche Panamera 4S 971 cat-back exhaust
- Purpose-built for Porsche 971 Panamera 4S 2.9T 440 PS 2016 onwards
- Valvetronic dual-valve, switchable exhaust — valves ON, OFF or AUTO via remote
- Plug and play OBDII controller with separate remote for instant control
- Drone reduction for relaxed motorway cruising
- One piece design, OEM-like fitment and alignment
- Dyno developed in house for performance-focused flow and response
- 3D scanning and reverse engineering for a precise, direct fit cat-back system
- Premium welding and 7 axis CNC bending for strength, accuracy and flow
Valvetronic control — switchable sound on demand
The Stone Valvetronic System gives you total control over your Porsche Panamera 4S exhaust note. Use the remote to toggle ON, OFF or AUTO. In AUTO mode you can configure the valves to open at a predefined RPM, so it stays civilised around town and comes alive when you want it. The system is plug and play through the OBDII port for a clean, fast installation.
OPF compatibility — OPF delete included on request
Running an OPF equipped Porsche Panamera 4S 971 2.9T? Stone offers an OPF delete solution that can be included free of charge. This lets you install the Stone cat-back on OPF cars without triggering error codes, so ECU coding to remove OPF faults is not required.
Engineering that makes the difference
R&D and 3D scanning
Stone engineers 3D scan the OEM Porsche Panamera 4S exhaust to analyse pipe diameter, routing and bend geometry. Using simulation of exhaust gas flow, thermal hot spots and pressure zones, the design is refined for optimal performance and fitment.
7 axis CNC bending
State-of-the-art bending achieves approximately 98 percent roundness with minimal outer bore wear at 180°. With reverse engineering and 3D design, Stone achieves an integrally moulded exhaust pipe with accuracy error under 0.025 mm, helping prevent flow obstruction and weld fractures.
Advanced welding techniques
Crisscross and overlapping welding increases penetration and width at high-stress joints. Direct spot welding by mechanical arms delivers consistent precision and strength, resulting in a highly durable, high-quality Porsche cat-back exhaust.
Compatibility
- Porsche 971 Panamera 4S 2.9T 440 PS, 2016 onwards
What you get
- Stone Exhaust Cat-Back Valvetronic Exhaust System for Porsche 971 Panamera 4S 2.9T
- Dual-valve Valvetronic setup
- Plug and play OBDII control module
- Remote control with ON, OFF and AUTO modes
- OPF delete available on request
Installation and support
Professional installation recommended. For fitting at Nforcd in Warwickshire, request a quote at Sales@nforcd.com. We are happy to advise on setup, OPF compatibility and day-to-day use.
Part number and warranty
Part number: QP507SQ
Warranty: Stone Exhaust 2 Year Warranty
Features at a glance
- Porsche Panamera 4S 971 2.9T cat-back exhaust
- Valved exhaust with remote control
- Switchable ON, OFF, AUTO modes
- Plug and play OBD2 controller
- One piece design with precise OEM-like fitment
- Drone reduction for comfortable cruising
- Dyno developed in house
- 3D scanning and reverse engineered
- 7 axis CNC bending
- Crisscross and overlapping welding plus direct spot welding
Media
Valvetronic system overview and installation
Sound clip — Stone Valvetronic on Porsche 971 Panamera 4S 2.9T
Gallery
Technical insights
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