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Stone Exhaust

Stone Exhaust Valved Cat-Back (Catback) for Porsche Cayenne Turbo V8 4.0T (E3) 2019-on - Valvetronic/Active Switchable Sports Performance Exhaust, OBDII/OBD2 Remote Plug & Play, OPF/GPF Compatible, Drone-Free QP511SQ

Stone Exhaust Valved Cat-Back (Catback) for Porsche Cayenne Turbo V8 4.0T (E3) 2019-on - Valvetronic/Active Switchable Sports Performance Exhaust, OBDII/OBD2 Remote Plug & Play, OPF/GPF Compatible, Drone-Free QP511SQ

£4,470.72
£5,588.40 £4,470.72
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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.

QP511SQ Stone Exhaust Cat Back for Porsche Cayenne Turbo V8 4.0 E3 2019 on

Give your Cayenne Turbo V8 the soundtrack and response it deserves. This Stone Exhaust switchable cat back transforms throttle feel and cabin character, delivering a deep, motorsport-inspired note under load with calm, drone free cruising on the motorway. Developed specifically for the E3 platform, it retains everyday refinement while unlocking serious theatre when you want it.

  • Direct replacement system for Porsche Cayenne Turbo V8 4.0 E3 2019 onward
  • Electronically controlled valves with handheld remote - choose Loud, Quiet or Auto by rpm
  • Plug in OBD port controller with adjustable valve opening threshold
  • No boom or resonance at steady speeds, refined in-cabin tone
  • 3D scanned and reverse engineered for precise OE style fitment
  • Dyno developed and validated by Stone for sound and flow
  • One piece bends and precision welding for optimal gas velocity
  • Part number: QP511SQ

Switchable valves, three driving characters

Use the supplied controller to flick between modes. Loud opens the valves for maximum presence and performance. Quiet keeps the flaps closed for early starts and town driving. Auto uses your chosen rpm point so the valves open only when you are on it. The control unit plugs into the diagnostic port so setup is fast and tidy.

Ready for OPF and GPF vehicles

Running a particle filter equipped Cayenne Turbo V8 4.0 E3. Stone includes an OPF solution at no extra cost. It allows this system to be fitted to OPF cars without warning lights, so ECU coding is not required.

Engineering highlights

Stone scans the factory exhaust to capture every dimension, then iterates routing, diameter and bend geometry using flow, thermal and pressure simulation. A 7 axis CNC bending process keeps up to 98 percent roundness through tight radii with accuracy down to 0.025 mm to minimise turbulence. Crisscross and overlapping weld techniques add strength at high temperature junctions, while robotic spot welding delivers consistent penetration. The result is a robust, high flow system that looks as good as it sounds.

Why choose this upgrade

We have installed this system on customer Cayenne Turbo builds and the feedback has been outstanding. Owners love the instant change in character, the crisp valve response from the remote and the lack of cabin drone on longer journeys. If you want a premium switchable exhaust for your Cayenne that blends quality, performance and everyday civility, this is it.

Fitment

  • Porsche Cayenne Turbo V8 4.0 E3 2019 onward

Installation

The valve controller is plug and play via the OBD port and can be set up in minutes. Professional fitting is recommended for the exhaust hardware. MJ Modifications offers installation at our Warwickshire workshop. For a fitting quote please email info@mjmodifications.co.uk.

Part number and warranty

Part number: QP511SQ
Manufacturer: Stone Exhaust
Warranty: 2 year Stone Exhaust warranty

3D scanning and reverse engineering for Cayenne Turbo V8 E3 Stone Exhaust upgrade
Stone Exhaust switchable cat back for Porsche Cayenne Turbo 4.0 E3
7 axis CNC bending on Stone Cayenne Turbo exhaust system
Stone Exhaust weld quality for Porsche Cayenne Turbo E3 system
Robotic spot welding for durability on Stone Exhaust systems

Sound and install videos

Cayenne Turbo V8 4.0 E3 switchable cat back sound

Valve controller installation overview

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