Valved Exhaust System for BMW M850i G14 / G15 / G16 4.4TT (2020-2026)
Configuration
BMW M850i G14 / G15 / G16 Valved Exhaust System (2020-2026)
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 M850i G14 / G15 / G16 exhaust in detail.
G14 convertible, G15 coupé or G16 Gran Coupé: the M850i is the rational grand tourer of the 8 Series, without the price or the radical edge of the M8. Its 4.4-litre twin-turbo N63, with the turbos in the vee, delivers 530 hp and a massive 750 Nm, with instant response. The 2020 to 2026 model years are the ones our page covers, with the six-cylinder 840i and the M8 presented on other pages.
The N63’s natural sound is among the finest in the BMW range, deep and pulsing, but between the particulate filter and silencers sized for total soundproofing, almost nothing of it is left outside. Open the valves on the Rog cat-back: the V8 finally rumbles, with a full, authoritative climb; close them, and the 8 Series remains the hushed GT for early-morning departures. Two cars in one.
On all three body styles, fitting is identical: no welding, clamps and gaskets, about two hours, for an exhaust made to your VIN and controlled by the factory control or the Rog remote.
The “Manifold” option sells the N63’s front section, with its catalytic converter; on its own, it adds voice and removes a little weight, with horsepower coming from an ECU remap. With 530 hp already on tap, most M850is stay with 200 cells, which preserves emissions control; 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. Titanium or 304 stainless steel: the former removes around 40% of the mass, the latter gives a thicker bass.
BMW M850i G14 / G15 / G16 4.4TT exhaust specifications.
| System type | Valved cat-back (valve exhaust), built to your VIN |
|---|---|
| Vehicles and chassis codes | BMW M850i G14 convertible, G15 coupé, G16 Gran Coupé |
| Engine | N63, 4.4-litre twin-turbo V8, 530 hp and 750 Nm |
| Years | 2020-2026 |
| 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 |
| Manufacturing and delivery | Made to order, 20 working days, free delivery |
| Warranty | 3 years, parts and workmanship |
Questions about the BMW M850i G14 / G15 / G16 4.4TT exhaust.
Are the very first M850i models, from 2018 or 2019, compatible?
Our page starts in 2020; for those early cars, provide the VIN and we will reply before building.
Can the M850i match an M8 at Stage 2?
Almost: the N63 is held back from the factory to preserve the hierarchy, and the published figures reach 700 hp and 980 Nm with the front section and an ECU remap at an approved tuner; the cat-back alone requires no map.
Vehicle inspection: how should a modified M850i be presented?
Like a standard GT: engine idling, valves closed, factory catalytic converters or 200-cell front section, and the N63 fades into the background; the 100-cell is accepted or not depending on the vehicle and your country’s rules, and the decat version is reserved for track use.
M850i convertible, coupé or Gran Coupé: a system for each?
Just one, according to our page, which lists the G14, G15 and G16 together; the VIN requested when ordering is used to adjust the mountings specific to your body style.
Does titanium change the sound of the M850i’s V8?
A little: for the same design, it weighs around 40% less and gives a brighter note at high revs, whereas 304 stainless steel keeps a thicker bass.
BMW M850i G14 / G15 / G16 4.4TT: 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 M850i G14 / G15 / G16 4.4TT: 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 M850i G14 G15 G16: waking up the N63, the complete exhaust system guide
The M850i is the rational grand tourer: the style and presence of the 8 Series and a 530 hp V8, without the price or the extremes of the M8. Its N63 is an engine with a naturally deep, charismatic character,...
In detail
Rog Advisor
A question about this exhaust?
Fitment, sound, catalyst, valves, delivery: the answer comes straight away, with your configuration in context.
The Rog Advisor is an automated assistant trained on our product pages and answers. For an important decision, write to us: we confirm by e-mail.
Unsure about your configuration? Talk to us before you order. We know your car. Write to us at contact@rogmotorsport.com: we reply in writing, in English, within 24 hours. Email us
Reviews imported from our previous system and translated from French; verified purchases carry the badge.
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.
-
Shipping
Ready to join you.
Reinforced packaging protects your exhaust in transit. The final step before giving your vehicle a new voice.
Customer builds
Your videos & photos
The Rog lines fitted on our customers' vehicles, in real conditions.
- Builds
- 500+
- Brands
- 28
- Satisfaction
- 4,9
The journal
News & advice
Best valved exhaust for the BMW M2 G87
Which valved exhaust for a BMW M2 G87? The options compared (sound, material, valves) and the Rog system made to...
Read the articleBest valved exhaust for the Audi RS3 8Y
Which valved exhaust for an Audi RS3 8Y? The options compared (sound, material, valves) and the Rog system made to...
Read the articleBest valved exhaust for the Mercedes-AMG A45 / A45 S W177
Which valved exhaust for a Mercedes-AMG A45 or A45 S W177? The options compared (sound, material, valves) and the Rog...
Read the articleExhaust rules: what changes in 2026 and 2027 (Euro 7, noise cameras, MOT)
Euro 7, new-car noise, noise cameras, MOT and vehicle inspection, and models: what really changes in 2026 and 2027 for...
Read the articleChanging your exhaust: what inspections and approvals cost in 9 countries
What the periodic inspection and the check of a modification cost after changing your exhaust, in 9 European countries: official...
Read the articleIs a cat-back exhaust legal in Ireland? What the NCT checks.
A cat-back leaves your factory cat, sensors and OBD as they are; valves closed, very close to stock, valves open,...
Read the articleSports exhaust (sportsummuti) in Estonia: what the tehnoülevaatus checks.
The sound you choose, a discreet car when it matters: what a Rog valved exhaust gives you in Estonia, how...
Read the articleSports exhaust in Latvia: tehniskā apskate and the CSDD noise limit.
The sound you choose, a discreet car when it matters: what a Rog valved exhaust gives you in Latvia, how...
Read the articleNo article matches this search.
All articles