Stone Exhaust Porsche E3 Cayenne Turbo 4.0T Cat-Back Valvetronic Exhaust System
Transform the sound and performance of your Porsche Cayenne Turbo 4.0T with the Stone Exhaust Valvetronic Cat-Back Exhaust System. Designed specifically for the Porsche E3 Cayenne Turbo 4.0T (2019 onward), this premium valved cat-back exhaust delivers a deep, aggressive tone on throttle, a refined, drone-free cruise, and proven gains from Stone’s in-house dyno development. Engineered via 3D scanning and reverse engineering of the OEM system, it guarantees precise OEM fitment and exceptional build quality. If you are searching for a Porsche Cayenne Turbo exhaust, Cayenne Turbo cat back, valved exhaust for Cayenne, OPF compatible exhaust, switchable exhaust or performance exhaust upgrade for the E3 Cayenne, this is the one.
- Direct-fit cat-back exhaust for Porsche E3 Cayenne Turbo 4.0T 2019 onward
- Valvetronic dual-valve design with remote control: ON, OFF, AUTO modes
- Plug and play OBDII control module with adjustable rpm valve operation
- Eliminates the drone often found on the standard exhaust
- 3D scanned and reverse engineered for perfect OEM-style fitment
- Developed and validated on Stone’s in-house dyno
- Precision mechanical welding and one-piece sections for optimal flow
- Part Number: QP511SQ
Valvetronic control. Maximum sound, zero compromise.
The Stone Valvetronic System is researched and developed in house to deliver reliable, switchable sound and flow. Use the remote to choose ON for maximum performance and sound, OFF for quiet city driving, or AUTO to open and close the valves at your chosen rpm threshold. The system is plug and play and connects to your OBDII port, so installation and setup are straightforward and fast.
OPF delete option included
Running an OPF-equipped Cayenne Turbo 4.0T? Stone offers an OPF delete that can be included free of charge. This allows installation of the Stone Cat-Back Exhaust on OPF cars without triggering error codes, so coding out the OPF on the ECU is not required.
Engineered to perform
Stone Exhaust engineers use 3D scanning and reverse engineering of OEM parts to analyse pipe diameter, routing and bend angles, then iterate with 3D flow, thermal and pressure simulation to maximise performance. Construction utilises a 7 axis CNC bending machine achieving up to 98 percent roundness with minimal outer bore wear at tight bends, reducing turbulence and preventing weld fracture. Accuracy is held within 0.025 mm for exceptional fit. Crisscross and overlapping welding increases penetration and strength at high-stress zones, while direct spot welding by mechanical arms delivers precise, durable joints. The result is a high-flow, integrally moulded cat-back exhaust that looks as good as it performs.
Why buy from Nforcd
We have fitted and used this Stone Exhaust on customer Porsche Cayenne Turbo 4.0T builds and the feedback has been consistently excellent on sound quality, valve control responsiveness and day-to-day drivability. If you want the best Porsche Cayenne Turbo valved cat back exhaust in the UK, this Stone system is a top choice for sound, quality and performance.
Compatibility
- Porsche Cayenne Turbo 4.0T E3 (2019 onward)
Installation and fitting
The Valvetronic control is plug and play via OBDII and can be installed within minutes. Professional fitting is recommended for the exhaust hardware. Nforcd offers installation at our facility in Warwickshire. For a fitting quote, email Sales@nforcd.com.
Part number and warranty
Part Number: QP511SQ
Manufacturer: Stone Exhaust
Warranty: Stone Exhaust 2 Year Warranty
R&D and manufacturing detail
Stone’s process starts with 3D scanning and reverse engineering of the OEM Porsche Cayenne Turbo exhaust, followed by simulation to optimise gas flow, temperature distribution and pressure. A 7 axis CNC bending machine ensures consistent, high-precision pipe geometry, while crisscross and overlapping welding techniques improve endurance at high-temperature joints. Direct spot welding using mechanical arms delivers repeatable penetration and strength, resulting in a cat-back exhaust that is robust, precise and built to perform.
Sound and install videos
Porsche E3 Cayenne Turbo 4.0T Valvetronic Cat-Back Exhaust System Sound
Stone Valvetronic System Installation
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