Stone Exhaust BMW M2 F87 N55 Valved Cat-Back Performance Exhaust | Switchable Flap/Valvetronic Sports System, Rear Section + Mid-Pipe Catback Muffler/Back Box Upgrade | OEM Valve Control, OPF/GPF Compatible | AP519

BMW M2 F87 N55 Switchable Sports Exhaust by Stone

Transform the character of your F87 with Stone’s valve-controlled rear system and hear your turbocharged straight-six at its best. This premium rear section and mid pipe combination brings a richer soundtrack, improved response and superb build quality, while retaining factory-style valve control for everyday refinement. Ideal for road and track, it delivers a purposeful tone under load and calm cruising with minimal cabin resonance.

Part Number: AP519

Highlights

• Direct-fit rear system for BMW M2 F87 with N55 engine using the original flap motors for seamless ECU-controlled operation
• Optional remote valve control kit with simple OBD port plug-in for manual open or quiet modes at the touch of a button
• Rolling-road verified gains with the trademark Stone soundtrack and sharper throttle feel
• 3D-scanned development for precise routing and true OEM-style fit
• Designed to keep cruising civil with low interior resonance and excellent NVH control
• Precision fabrication with accurate spot welding plus overlapping techniques for durability under heat
• 7-axis CNC bending for smooth radii and consistent pipe roundness to maximise flow
• Backed by a 2-year Stone Exhaust warranty

Proven power on the dyno

Expect gains of up to +16.9 PS at 5800 rpm and +21.6 Nm at 3600 rpm. Enjoy stronger mid-range pull, crisper response and a deeper, more engaging tone that suits the M2’s character.

Factory flap integration with optional remote control

Keep the best of both worlds. The system reuses the OE flap motors so the ECU manages the valves just like standard. Prefer full manual control. Add Stone’s dual-valve remote kit for instant open or closed modes via a neat OBD plug-and-play controller.

OPF and GPF friendly solution

Running a particulate filter. Stone includes an OPF delete solution at no extra cost so you can install without error codes, removing the need for ECU coding on compatible vehicles.

Engineering that makes the difference

Stone begins with a full 3D scan of the OE system to perfect pipe diameter, route and bend angles. Computational flow work is used to optimise gas speed, temperature control and pressure balance. The 7-axis CNC bending process ensures exceptional roundness, while carefully executed spot, crisscross and overlapping welds enhance strength and longevity at critical joints.

Vehicle compatibility

• BMW M2 F87 N55 2014+
• BMW M2 F87 LCI N55 2016+

Installation

Designed as a straight swap on compatible models with no cutting required. For professional fitting, book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

What owners are saying

We have fitted this system on customer M2s and our own cars. Fitment is precise, valve control is slick and the tone is spot on: deeper, sportier and still refined on the motorway. Feedback has been consistently positive on quality, sound and drivability.

Watch and listen

Gallery

R and D

Warranty

Stone Exhaust 2-year warranty for peace of mind.

Manufactured by

Stone Exhaust

Part number

AP519

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