Stone Exhaust Volkswagen Golf R MK7.5 EA888 Valvetronic Cat-Back Exhaust (2016+) - GP509S | Valved Catback, Plug & Play OBDII, No Drone, OPF Delete Option

Golf 7.5 R Switchable Exhaust System | Part Number GP509S

Unlock the sound, response and refinement your facelift 7R deserves. This premium switchable cat back replaces the factory system on the 2016 onward Golf R, delivering a deeper tone when cruising and a fierce, motorsport bark when you want it. Developed with full 3D scanning, reverse engineering and in-house dyno work, it fits like OEM, looks stunning and transforms the drive without unwanted cabin resonance.

We have installed this system for customers at MJ Modifications in Warwickshire and the feedback is superb. Clients love the quality, the clean welds, the precise valve control and the way it stays civil with the flaps shut yet comes alive when opened. If you are searching for a Golf 7.5 R performance exhaust upgrade that is switchable via a handheld controller and delivers zero drone on the motorway, this is the one to choose.

Key reasons enthusiasts pick GP509S for the 7.5R

• Designed for the facelift Golf R with the EA888 Gen 3 turbo engine for exact fitment
• Twin electrically operated valves with ON, OFF and AUTO modes using the included remote
• Plug-in OBD2 control for quick, tidy installation with no splicing
• Single-piece flow path for maximised gas speed and strength
• Drone-free cruising and a refined tone in Comfort mode
• Developed using 3D scanning, simulation and confirmed on the dyno
• Precision mechanical welding for durability and leak-free performance
• Distinctive sound profile that suits daily use and spirited driving

Valve control, your way

Choose quiet, loud or intelligent. Use the remote to select:

• ON for an aggressive, open-valve soundtrack
• OFF for a discreet, neighbour-friendly drive
• AUTO to let the system open and close at the RPM you set

The controller plugs into the OBD port for a clean, reversible install in minutes. No coding required for operation of the valves.

OPF and GPF compatible

Running a particulate filter equipped car. An OPF delete option is available at no extra cost so you can fit this cat back on OPF vehicles without triggering a warning. No ECU coding to remove fault lights is needed.

Engineered to perform

The OEM system is fully 3D scanned to capture routing, bends and diameters. Engineers then optimise gas flow, heat management and pressure zones with digital simulation. Tube work is formed on a 7-axis CNC bender to achieve up to 98 percent roundness with accuracy under 0.025 mm, cutting turbulence and helping prevent stress cracks. Crisscross and overlapping welds plus direct spot welding reinforce high temperature areas for long-term reliability.

Dyno-proven results

• Power gain: +12.7 Ps at 0 rpm
• Torque gain: +44.12 Nm at 0 rpm

What is included

• Golf 7.5 R cat back exhaust assembly with valve control
• Remote handset with ON, OFF and AUTO functions
• Plug-in OBD2 control module
• OPF delete option supplied free of charge for OPF equipped cars

Fitment

• 2016 onward Golf R facelift models with the EA888 engine

Installation and support

Want it fitted by specialists. Book your install with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Part number and warranty

• Part number: GP509S
• Manufacturer warranty: 2 years

Real-world praise

Our customers consistently report excellent build quality, precise fitment and a best-of-both-worlds character. Calm when commuting, wild on back roads, and no intrusive boom in the cabin.

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