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Stone Exhaust

Stone Exhaust AP528 BMW G30 M550i xDrive (N63R) OEM-Integrated Valved Cat-Back Exhaust System

Stone Exhaust AP528 BMW G30 M550i xDrive (N63R) OEM-Integrated Valved Cat-Back Exhaust System

£3,841.92
£4,802.40 £3,841.92
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Tailpipe Finish

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Stone AP528 for BMW G30 M550i xDrive N63R - Valve Controlled Cat Back Exhaust

Unlock a deeper V8 soundtrack and sharper response on your G30 5 Series M550i xDrive with the Stone AP528 valve controlled cat back. This system retains factory electronic flap functionality for quiet cruising and an aggressive tone on throttle, giving you the best of both worlds for daily use and spirited driving.

We have installed Stone systems on customer cars and our own projects. Fit is spot on, the tone is addictive and the build quality is superb. Feedback from M550i owners has been consistently positive for sound character, drivability and seamless integration with the car’s electronics.

Top reasons to choose AP528

  • Factory valve compatibility - uses your BMW’s original valve control for effortless switch between comfort and sport.
  • Optional Stone Valvetronic upgrade - add remote control for manual open and close whenever you want.
  • CAD and 3D scan developed - designed from the OEM layout for precise alignment and a true bolt on install.
  • Dyno validated by Stone - engineered for improved flow and a refined, motorsport inspired note.
  • Strong, durable construction - precision welding, carefully controlled bends and robust joints built to handle heat and mileage.
  • Engineered for the N63R platform - tailored specifically to the G30 M550i xDrive 4.4 twin turbo V8.

Engineering highlights

  • One piece sections with precision mechanical welding for strength and long term reliability.
  • 7 axis CNC bending for exceptional roundness and consistent internal diameter to reduce turbulence.
  • Crisscross and overlapping weld techniques where temperatures peak for added endurance.
  • Direct spot welding by mechanical arms for accuracy and a clean finish.
Stone Exhaust 3D scanning of BMW G30 M550i xDrive N63R cat back

OPF and GPF equipped cars

Using a particulate filter. Stone supplies an OPF delete solution on request at no extra charge so you can fit this cat back to OPF vehicles without warnings, removing the need to code out the filter.

Valve control options

Keep the factory flap control operated by your ECU or upgrade to the Stone Valvetronic package with dual valves and a handheld remote for manual control at any time.

Stone Exhaust precision CNC bending for BMW G30 M550i cat back
Stone Exhaust advanced welding for BMW M550i xDrive G30 system

Hear it on car

Deep, refined and sporty with the valves closed and a hard edged V8 bark when open.

Vehicle fitment

  • BMW 5 Series G30 M550i xDrive
  • Engine code N63R
  • Model years 2015 onwards

Product info

  • Brand: Stone Exhaust
  • Type: Valve controlled cat back with factory valve integration
  • Part number: AP528
  • Warranty: 2 year Stone Exhaust warranty

Installation and support

For professional fitting, choose MJ Modifications in Warwickshire. We know these systems inside out and our customers love the results. Request a fitting quote at info@mjmodifications.co.uk.

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Manufactured by

Stone Exhaust

Part number

AP528

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