Valved Exhaust System for BMW XM S68 G09 V8 4.4T PHEV (2023+)
Configuration
BMW XM S68 G09 V8 4.4T PHEV Valved Exhaust System (2023+)
Valves
Operated by remote control, factory-paired.
Estimated at 0.50 m from the outlet, 45°, 2,000 rpm with a warm engine. Allow ± 2 dB depending on the engine and measuring point. A 3 dB difference is audible in a direct comparison; 10 dB sounds roughly twice as loud.
Configuration guide
Sound intensity with the valves open, on a scale of 0 to 10.
| Configuration | Intensity |
|---|---|
| Decat downpipe + Rog cat-back | 10/10 |
| 100-cell sports catalytic converter + Rog cat-back | 9/10 |
| 200-cell sports catalytic converter + Rog cat-back | 8/10 |
| Rog cat-back only, factory catalytic converter retained | 7/10 |
| Factory exhaust, for comparison | 3/10 |
The BMW XM G09 exhaust in detail.
The first model designed entirely by BMW M since the M1, the XM G09 combines the S68, a 4.4-litre twin-turbo V8 with its turbos inside the V, with an electric motor and a plug-in battery. In combined figures, it is rated at 653 hp and 800 Nm, and 748 hp with 1,000 Nm in Label form. We document it for cars built since 2023; the hybrid M5 G90, with a related engine, has its own page.
On a hybrid, the V8 does not run all the time, which makes every combustion start-up striking; the heavily filtered factory exhaust, however, makes it an almost imperceptible event, and the S68’s deep rumble hardly ever comes through. With the valves open, our cat-back makes every awakening of the V8 noticeable and accompanies acceleration with a broad rumble; with the valves closed, the XM keeps the refinement of its electric driving.
Neither the engine, nor the ECU, nor the hybrid system is modified: the system, bent to your VIN, fits without welding using clamps and gaskets in about two hours, with the original valve control or the Rog remote.
The “Manifold” option sells the front section that follows the S68’s turbos; on its own, it affects the voice and the weight, and turning it into power calls for an ECU remap reserved for tuners who master hybrid electronics. For this plug-in hybrid SUV, the 200-cell catalysed version keeps exhaust gas treatment; the 100-cell is accepted or not depending on the car and the rules in your country, and the decat version is reserved for track use. On such a heavy SUV, titanium, around 40% lighter than 304 stainless steel, earns its place.
BMW XM S68 G09 V8 4.4T PHEV exhaust specifications.
| System type | Valved cat-back (valve exhaust), built to your VIN |
|---|---|
| Vehicle and chassis code | BMW XM G09 and XM Label |
| Engine | S68, 4.4-litre twin-turbo plug-in hybrid V8, 653 hp / 800 Nm or 748 hp / 1,000 Nm combined |
| Years | 2023+ |
| Materials and finishes | 304 stainless steel or titanium; titanium in brushed, gold or purple |
| Valves | Factory valve control if the car has it, otherwise the Rog remote |
| Front section (option) | Front section with a 200-cell or 100-cell catalyst, or decat |
| Fitting | Clamps and gaskets, no welding, about 2 hours on a lift |
| Manufacturing and delivery | Made to order, 20 working days, free delivery |
| Warranty | 3 years, parts and workmanship |
Questions about the BMW XM S68 G09 V8 4.4T PHEV exhaust.
Does the 748 hp XM Label take the same system as the 653 hp XM?
Yes: at 653 or 748 hp, the base XM and the Label share the system on the page, for cars built since 2023; we identify your version from the VIN before building.
Does an XM’s hybrid S68 lend itself to an ECU remap?
The page lists 900 hp and 1,150 Nm in Stage 2 for both versions; on a hybrid platform of this calibre, the work belongs with a tuner who masters its electronics, and the cat-back on its own does not touch it.
BMW XM S68 G09 V8 4.4T PHEV with a Rog exhaust: what should you know about vehicle inspection?
With the cat-back only or the 200-cell sports catalytic converter, emissions control is retained: present the car with the valves closed. The 100-cell brings more sound and flow, and whether it is accepted at the emissions test depends on the car and local rules; the decat version is intended for track use.
Is the six-cylinder XM 50e covered?
No, this system does not extend to the XM 50e; it targets the XM with the S68 V8.
Does the XM stay silent when driving on electric power?
Yes, since the V8 is then switched off; our system only speaks up when it wakes, valves open or not as you choose.
BMW XM S68 G09 V8 4.4T PHEV: Does a valved exhaust system drone?
No. With the valves closed, the gases flow through the whole rear silencer and the cabin stays calm at a steady speed. Our Rog exhausts are designed to avoid drone. Learn more: Why our systems stay calm on the motorway.
BMW XM S68 G09 V8 4.4T PHEV: straight pipe or resonator?
On this model, two characters at the same price: the straight pipe for the raw sound of your engine, unfiltered, or the resonator for a rounder and slightly softer voice. Either way, the exhaust stays fully sporty. Learn more: Exhaust resonator: what does it do? Straight pipe or resonator, which sound to choose.
Rog expert guide
BMW XM S68 G09 V8 PHEV: the V8 behind the hybrid, the exhaust system guide
The first model developed entirely by BMW M since the M1, the XM pairs an S68 biturbo V8 with a plug-in hybrid drivetrain, for 653 hp and 800 Nm combined. Such an engine deserves to be heard, yet the factory...
In detail
Rog Advisor
A question about this exhaust?
Fitment, sound, catalyst, valves, delivery: the answer comes straight away, with your configuration in context.
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Rog presentation film: choosing your vehicle, Standard or Equal Length design, stainless steel or titanium, Z-Pipe, controlled valves, titanium and tip finishes, and support from choosing your configuration through to shipping.
THE Rog CRAFT
Our process.
From the first bend to the last check. The same care at every step.
-
Design
Designed for your vehicle.
Geometry matched to your model, carefully studied bends and precise mounting points. Everything starts with accurate design.
-
Manufacture
Crafted with precision.
Tube bending, part fitting and TIG welding: every joint receives the same care.
-
Finishing
Material, elevated.
The finish reveals the character of the metal. Stainless steel or titanium, depending on the options available for your vehicle.
-
Assembly
Every part in its place.
Components are assembled and adjusted. On valved systems, the mechanism is fitted, set up and tested.
-
Inspection
Check. Then approve.
Geometry, welds, connections and gas flow: the key points are inspected before shipping.
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Shipping
Ready to join you.
Reinforced packaging protects your exhaust in transit. The final step before giving your vehicle a new voice.
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