Guides BMW 8 Series G14 / G15 / G16
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, but the factory exhaust, designed for quiet cruising, keeps it permanently in the background. This guide explains how to free up your M850i and how to choose each option: catalytic converter, vehicle inspection, engine warning light, material and valves. For your BMW M850i G14 / G15 / G16, this guide sets out what each choice changes: material, front section, sound, valves and fitting.
Your valved exhaust for BMW M850i G14 / G15 / G16 is configured from your VIN, and the BMW 8 Series G14 / G15 / G16 Valved Exhaust page brings together every system we make for this generation.
Valved Exhaust System for BMW M850i G14 / G15 / G16 4.4TT (2020-2026)From 2 890 € · free delivery · 20 working days
View
Your Rog exhaust for the BMW M850i G14 / G15 / G16
Price shown on the product page, in your currency
Configure my exhaustThe short answer.
- Vehicles
- BMW M850i G14 / G15 / G16 4.4TT (2020-2026)
- Engine
- 530 hp · 750 Nm
- Exhaust
- Valved cat-back, built for your VIN
- Material
- 304 stainless steel or titanium
- Front section
- Optional: catted downpipe with 200 or 100 cells, or decat
- Valves
- Rog remote, or factory control if your vehicle has it
- Lead time
- 20 working days from order confirmation to delivery
- Warranty
- 3 years, parts and workmanship
Closely related versions have their own guide: BMW 840i B58 G16 3.0T, BMW M5 F10 4.4TT, BMW M550i N63 G30 4.4TT, BMW M6 F06 / F12 / F13 4.4TT.
The N63: a V8 full of character under limousine lines
The twin-turbo 4.4L N63 in the M850i shares its hot-vee layout with the S63 of the M cars: turbos inside the V, instant response and a massive 750 Nm of torque. Its natural sound is one of the finest in the BMW range, deep and pulsing. But between the OPF and silencers sized for total sound insulation, almost nothing of it reaches the outside.
The Rog exhaust frees that voice without changing the car's nature: with the valves closed, the 8 Series remains a hushed GT. With the valves open, the N63 finally rumbles like a true V8. The remote gives you two cars in one.
How the exhaust on your BMW M850i G14 / G15 / G16 is put together
An exhaust system is best understood in two parts. Here is what each one does, and what Rog replaces.
The cat-back is the complete exhaust system
It is everything you can see under your BMW M850i G14 / G15 / G16, from the outlet of the front section to the tips: pipes, silencers, valves. This is where our research and development is focused, and it is what shapes the sound. On its own, it changes the character of the car.
The front section, where the catalytic converter sits
On your BMW M850i G14 / G15 / G16, it is the downpipe, the pipe leading from the turbo. It contains the factory catalytic converter: the second restriction in the exhaust, after the silencer. Replacing this part is optional: it frees up the flow, and an ECU remap is what turns that into power.
The figures for your BMW M850i G14 / G15 / G16
On a modern car, an exhaust system first changes the voice, the breathing and the weight at the rear. Power, on the other hand, comes from an ECU remap.
Power
Torque
Published factory and Stage 2 figures.
Our exhaust systems work perfectly with or without an ECU remap. On your BMW M850i G14 / G15 / G16, however, we recommend having one done at an approved tuning centre: that is what lets the engine reach its full potential.
The N63 is deliberately restrained at the factory to preserve the hierarchy with the M8. That is excellent news for you: the headroom is in the engine. With the Rog exhaust and an ECU remap at an approved tuning centre, the M850i closes in on the figures of a standard M8, while keeping its refinement as a grand tourer.
Configuring your exhaust, step by step
3 choices, in the same order as the product page configurator.
-
Step 1 of 3: Material: stainless steel or titanium
Titanium costs more than stainless steel; the price of each version is shown on the product page, in your currency.
304 stainless steel
- Weight
- Baseline
- Sound
- Full and rounded
The benchmark for high-end exhausts: tough, corrosion-proof, with a full, rounded sound. The choice of most of our customers.
Titanium
- Weight
- Around 40% lighter
- Sound
- Metallic, crystal-clear
Around 40% lighter than stainless steel for the same design, with a more metallic sound that turns crystal-clear at high revs. Its finish ranges from brushed to blued tints.
Over time, both hold up: 304 stainless steel stands up to winter salt and damp, and titanium does not rust. Stainless steel or titanium: what really changes.
-
Step 2 of 3: Front section: downpipe and catalytic converter
Optional: the downpipe on your BMW M850i G14 / G15 / G16, with its catalytic converter. Sound intensity is rated on our scale of 0 to 10, valves open; the factory exhaust scores 3.
Cat-back only
Included
7/10Factory emissions control
The factory catalytic converter stays in place. The starting point and, for many of our customers, more than enough.
200-cell sports catalytic converter
8/10Road use and inspection
Emissions control is still very much there, and flow improves noticeably. The choice for everyday driving.
100-cell sports catalytic converter
9/10Inspection: depends on local rules
Half as many cells: flow comes close to a decat and the sound gains real aggression at high revs.
Decat
10/10Track use
No emissions control: maximum flow, raw sound, the sharpest revving.
Sound intensity, on a scale of 0 to 10
- 10/10Decat downpipe + Rog cat-back
- 9/10100-cell sports catalytic converter + Rog cat-back
- 8/10200-cell sports catalytic converter + Rog cat-back
- 7/10Rog cat-back only, factory catalytic converter retained
- 3/10Factory exhaust, for comparison
Valves open. With the valves closed, every configuration becomes discreet again.
What about the engine warning light? With a sports cat, it can come on with some engines: the sensor placed after the catalytic converter measures a different level of emissions control from the original. It is not a mechanical failure, but a warning light should never be masked or cleared without dealing with its cause: the right answer is a catalytic converter suited to the engine, with a map by a tuner who takes it into account. The decat version, for track use only, almost always triggers it. If this happens to you, write to us and we will point you in the right direction. Passing vehicle inspection with a sports exhaust.
-
Step 3 of 3: Valves: Rog remote or factory control
Two ways to control the valves on your BMW M850i G14 / G15 / G16.
Rog remote
A small control unit fits in the boot. Two buttons, open and closed: the valves respond at any moment, whatever the drive mode. Simple to fit, and we stay on hand throughout the installation.
Factory control
- Only for vehicles fitted with factory valves
- Controlled by the drive modes
If your vehicle is fitted with factory valves, the exhaust keeps their existing control. The drive modes decide, just as they did from the factory, with no added electronics.
On the motorway, with the valves closed, the gases pass through the silencer, designed for cruising: no drone at a steady speed. You open up when you feel like it, not when the motorway decides for you. More about exhaust drone.
Your choices carry over to the product page: only the finishes, your VIN and the cart remain.
The Rog sound signature on the N63
On a V8, the acoustic work is not about adding noise but about removing what masks the engine. Our exhaust system removes the factory restrictions and oversized silencers to release the N63's natural pulse: a deep, low rumble at idle, a full and authoritative build-up under load, and sharp crackles on lift-off when the valves are open. With the valves closed, the V8 turns hushed again, perfectly suited to long journeys and early-morning starts.
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.
From order to fitting
-
Configuration
You choose your exhaust and enter your VIN, found in box E of your registration document or at the base of the windscreen.
-
Check
We check compatibility with your VIN before manufacturing begins.
-
Manufacturing
Your exhaust is made to order, for your car.
-
Delivery
Free, insured to your door, tracked from dispatch.
-
Fitting
No welding or cutting: clamps and gaskets, around two hours on a lift.
20 working days from order confirmation to delivery
- Warranty
- 3 years, parts and workmanship, from the date of purchase
- Payment
- Card, PayPal or bank transfer
- Installation
- At the garage of your choice
What about the manufacturer's warranty on your BMW M850i G14 / G15 / G16? In Europe, a manufacturer cannot refuse warranty cover simply because a part from another brand has been fitted: it has to prove that the fault was caused by that part. Our article on the manufacturer's warranty.
Our recommendations for your BMW M850i G14 / G15 / G16
-
Daily driving
- Stainless
- Cat-back only
- Rog remote
Your BMW M850i G14 / G15 / G16 stays easy to live with, the factory emissions control is retained, and you open the valves whenever you decide.
View this configuration -
Fast road
- Titanium
- 200-cell downpipe
- ECU remap
More sound, more breathing, and a car you can still present at vehicle inspection.
View this configuration -
Track
- Titanium
- Decat downpipe
- Stage 2
The most extreme configuration, for track use only.
View this configuration
And if you are still unsure, that is perfectly normal: it is exactly why we answer every message.
BMW M850i G14 / G15 / G16: your questions
How much power does an exhaust system add to the BMW M850i G14 / G15 / G16?
As standard, the BMW M850i G14 / G15 / G16 produces 530 hp and 750 Nm. An exhaust system on its own mainly changes the sound, the breathing and the weight; power is gained with an ECU remap. With a Stage 2 build, the published figures reach 700 hp and 980 Nm.
Stainless steel or titanium: which material for the BMW M850i G14 / G15 / G16?
The Rog exhaust comes in stainless steel and titanium, at the price shown on the product page in your currency. 304 stainless steel is tough, rounded in tone and the most popular choice; titanium is around 40% lighter for the same design, with a more metallic sound at high revs.
Do you need to replace the catalytic converter on the BMW M850i G14 / G15 / G16?
No. On the BMW M850i G14 / G15 / G16, the cat-back alone carries the valves and already transforms the sound. Replacing the downpipe is an option for going further: with a 200-cell sports catalytic converter for the road, 100-cell or decat for more radical use, with an ECU remap to turn it into power.
Will a Rog exhaust pass vehicle inspection on the BMW M850i G14 / G15 / G16?
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.
How is the Rog exhaust fitted to the BMW M850i G14 / G15 / G16?
No welding or cutting, using clamps and gaskets. Allow two hours on average for a well-equipped mechanic. The exhaust is built for your VIN, which guarantees compatibility before it ships.
What does a Rog exhaust cost for the BMW M850i G14 / G15 / G16, and how long does it take?
The price depends on the configuration and is shown on the product page, in your currency. Allow 20 working days from order confirmation to delivery. Free delivery and a 3-year warranty.
Valved Exhaust System for BMW M850i G14 / G15 / G16 4.4TT (2020-2026)
From 2 890 € · 3-year warranty
Configure my exhaustUnsure about your configuration? Write to us.
Stainless steel or titanium, cat-back only or the complete system: the right choice depends on how you drive and on your BMW M850i G14 / G15 / G16. We take the time to talk it through before you order, with a reply within 24 hours. We are not here to push a sale: we help you choose, even if that means a cheaper option because it suits the way you drive. Write to us: we reply in writing, in English.
RogMotorsport is a French brand built on one conviction: with an exhaust system, the support matters as much as the product. More than 500 exhaust systems fitted and a rating of 4.9 out of 5.
Further reading
Read next
- Mercedes-AMG E55 W211 / S211 V8 Kompressor: the wolf in a business suit, the exhaust guide With the E55 W211, AMG slipped a 476 hp, 700 Nm supercharged V8 into an E-Class that looks...
- Mercedes-AMG CLS53 C257: the return of the straight-six, the exhaust system guide A four-door coupé with flowing lines, the CLS53 C257 benefits from Mercedes' return to a layout the brand...
- Toyota GR Supra A90 L6: the B58 takes centre stage, the exhaust system guide The GR Supra A90 revived a legendary line by pairing a short rear-wheel-drive chassis with the B58 3.0-litre...