Stone Exhaust BMW N63R G30 M550i xDrive OEM Integrated Valved Cat-Back Exhaust System — Part Number AP528
Upgrade your BMW G30 M550i xDrive N63R with the Stone Exhaust OEM Integrated Valved Cat-Back Exhaust System. This performance exhaust delivers the signature Stone sound, improved flow and genuine OEM-style valve integration. Perfect if you are searching for BMW M550i exhaust, G30 M550i xDrive catback, BMW N63R valved exhaust, BMW 5 Series performance exhaust, M550i cat-back exhaust, BMW M550i valvetronic exhaust or Stone Exhaust AP528 in the UK.
We have fitted and tested Stone systems on customer cars and our own builds. Fitment is precise, the sound is addictive and the quality speaks for itself. Customer feedback on this BMW M550i valved catback has been consistently excellent regarding tone, drivability and OEM-level integration.
Why choose this BMW M550i xDrive cat-back exhaust
- OEM integrated valves. The ECU controls the exhaust valves automatically for comfort when cruising and performance when you want it.
- Optional Stone Valvetronic System (dual valves) for remote valve control via the Stone controller.
- Designed via 3D scanning and reverse engineering of the OEM system for 100% OEM fitment and alignment.
- Dyno developed in-house by Stone for proven performance gains with a refined, sporty tone.
- One-piece design with precision mechanical welding for strength and durability.
- 7 axis CNC bending for exceptional roundness and flow consistency.
- Crisscross and overlapping welding techniques for endurance at high temperatures.
- Direct spot welding by mechanical welding arms for superior precision.
- Developed specifically for the BMW N63R engine platform in the G30 M550i xDrive.
Product highlights
- Brand: Stone Exhaust
- Application: BMW 5 Series G30 M550i xDrive (N63R)
- Type: OEM Integrated Valved Cat-Back Exhaust System
- Part number: AP528
- Compatibility: G30 M550i xDrive (2015+)
- Warranty: Stone Exhaust 2 Year Warranty
OPF delete support
Running an OPF car and want a cat-back without errors. Stone offers an OPF delete solution that can be included free of charge. This allows you to install the Stone cat-back on OPF-equipped cars without throwing an error code, so coding out the OPF in the ECU is not required.
Stone Valvetronic control options
Choose between OEM integrated valves that are managed by your BMW ECU or upgrade to the Stone Valvetronic System with dual valves and a remote controller for manual open and close control whenever you like.
R&D excellence for BMW M550i performance
Stone engineers use detailed reverse engineering by 3D scanning OEM parts to understand functionality and pinpoint flow restrictions. Pipe diameter, route and bend angles for the BMW N63R G30 M550i xDrive exhaust are optimised using advanced 3D simulation to model exhaust gas flow, thermal zones and pressure changes, then validated on the dyno.
7 axis CNC bending
Constructed using a 7 axis CNC bending machine for extreme precision. Stone achieves up to 98% roundness with minimal outer bore wear at 180 degrees. This reduces turbulence, prevents weld fractures and ensures consistently smooth flow. Combined with 3D scanning and reverse engineering, tolerances are exceptional.
Advanced welding for reliability
The turbo to downpipe area experiences extreme heat. Stone uses crisscross and overlapping welding to increase weld width and penetration, improving endurance where it matters most.
Direct spot welding
Direct spot welding by mechanical arms delivers greater accuracy and penetration than manual welding, resulting in a robust and beautifully finished BMW M550i exhaust system.
Hear the Stone Exhaust on a BMW N63R G30 M550i xDrive
Experience the tone of the Stone Valvetronic cat-back on the BMW G30 M550i xDrive N63R. Deep, refined and sporty with OEM valve control.
Compatibility
- BMW 5 Series G30 M550i xDrive (2015+)
- Engine: N63R
Fitting and support
For professional installation, choose Nforcd in Warwickshire. We know these systems inside out, and our customers love the results. Request a fitting quote at Sales@nforcd.com.
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Manufactured by
Stone Exhaust
Warranty
Stone Exhaust 2 Year Warranty
Part number
AP528