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Stone Exhaust

Stone Exhaust Porsche Cayenne S E3 2.9T V6 (2019+) Valvetronic Valved Sports Exhaust Kit – Cat-Back / Axle-Back Rear Silencer Back Box – Remote Valve Control & OBD Plug-and-Play – OPF/GPF Solution – Active Performance Exhaust – QP509BSQ

Stone Exhaust Porsche Cayenne S E3 2.9T V6 (2019+) Valvetronic Valved Sports Exhaust Kit – Cat-Back / Axle-Back Rear Silencer Back Box – Remote Valve Control & OBD Plug-and-Play – OPF/GPF Solution – Active Performance Exhaust – QP509BSQ

£4,156.80
£5,196.00 £4,156.80
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Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.

Porsche Cayenne S E3 2.9 twin turbo switchable valve rear system with remote control

Bring your E3-chassis Cayenne S to life with this premium switchable valve rear section from Stone Exhaust. Engineered for the 2019 onwards 2.9 twin turbo V6, it delivers a deeper, more purposeful soundtrack when you want it, and a calm, refined cruise when you do not. Built for precise fit and effortless installation, this is a bolt-on upgrade that transforms character, response and enjoyment every time you drive.

Part number: QP509BSQ

Why enthusiasts choose this upgrade

  • Direct replacement for the factory rear system on Porsche Cayenne S E3 2.9T (2019+)
  • Switchable valves with handheld remote for open, closed or automatic RPM-based operation
  • Plug-in controller via the OBD port for clean, reversible installation
  • Laser-scanned and CAD-developed for factory-like alignment and clearances
  • Multi-axis CNC formed tubing for smooth gas flow and crisp throttle feel
  • Refined cabin manners with minimal drone when valves are closed
  • OPF/GPF solution included to prevent warning lights on particulate filter cars
  • Precision welds and robust construction for long-term reliability
  • Developed and validated on the dyno for consistent performance
  • Backed by a 2 year manufacturer warranty

Valve control at your fingertips

Go from subtle to sport with the supplied remote. Choose open valves for maximum sound and flow, closed valves for a discreet drive, or set automatic mode to let the system open at a user-defined engine speed. The control module connects through the vehicle’s OBD port for a neat, plug-and-play set-up.

Designed to fit. Tuned to thrill.

This performance rear section is created using detailed scans of the original equipment system to ensure perfect routing and hanger alignment. The result is a high-quality, bolt-on solution that sits correctly, clears heat shields and undertrays, and delivers the tone you expect from a premium Porsche SUV upgrade.

Compatibility

  • Porsche Cayenne S E3 2.9T V6 twin turbo, 2019 onwards

What owners say

We have supplied and installed this Stone valve-controlled rear section for many Cayenne S customers and feedback has been excellent. Standout comments include the quality of the build, the seamless fit and the ability to switch from quiet to aggressive at the touch of a button. It is a genuine daily-driver friendly sound upgrade with the punch you want on spirited drives.

Installation

Professional fitting recommended. MJ Modifications offers in-house installation in Warwickshire with technicians experienced in Porsche E3 platforms and Stone valve control set-ups. Request a fitting quote: info@mjmodifications.co.uk.

OPF/GPF information

Includes an OPF/GPF solution at no extra cost to prevent particulate filter related error codes. No coding required with this system when installed as directed.

Manufacturer and warranty

Manufacturer: Stone Exhaust

Warranty: 2 years

Watch how the valve control works

Sound check

Gallery

Porsche Cayenne S E3 2.9T switchable valve rear exhaust system by Stone

Cayenne S E3 2.9T upgrade rear section with valve control

Valve-controlled performance exhaust for Porsche Cayenne S 2.9T

Stone Exhaust rear system fitment on E3 Cayenne S

Porsche Cayenne S 2.9T performance exhaust upgrade UK

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Part number

QP509BSQ

Questions or want us to supply and install in Warwickshire? Email info@mjmodifications.co.uk and the MJ Modifications team will be happy to help.

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