BMW X4 G02: giving the coupé SUV some character, the exhaust guide
The X4 G02 combines the sloping silhouette of a coupé SUV with the proven X3 platform, and its 2.0-litre petrol version relies on the B48, a flexible and lively turbocharged four-cylinder. The factory exhaust filters it to the point of making it anonymous, which sits badly with the car's bold styling. With this guide, it is up to you to choose the ROG configuration that will match your X4's sound to its design.
Written by ROG Motorsport · Updated
Your ROG exhaust for BMW X4 G02
From €2,490 in stainless steel, €2,990 in titanium
Configure my exhaust- Vehicles
- BMW X4 G02 2.0T (2018-2025)
- Engine
- B48 · 184 to 252 hp · 290 to 350 Nm, depending on the version
- 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 X4 M40i G02 3.0T, BMW X4 F26 2.0T, BMW X4 M F98 3.0T.
The B48 in the X4 G02: a turbocharged four-cylinder in search of character
The B48 is a 2.0-litre direct-injection inline-four, boosted by a twin-scroll turbo. On the X4 G02, its output varies by version and reaches 252 hp and 350 Nm in the most powerful one. The torque arrives early, which suits an SUV of this size well: strong pick-up, smooth progress, and a liveliness that often surprises those discovering the car.
On a forced-induction engine, the turbine already dampens part of the sound; the X4's factory exhaust, designed for comfort, finishes the job of neutralising it. The ROG exhaust replaces the factory system and leaves the engine as BMW delivered it, ECU included. With the valves closed, nothing changes for your passengers. With the valves open, the B48 takes on a deeper, more present voice, in keeping with the car's sporty design.
What makes up the exhaust on your BMW X4 G02
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 X4 G02, from the outlet of the front section to the tips: pipes, silencer, 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 X4 G02, 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.
Your BMW X4 G02 in figures
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. Factory figures vary by version; Stage 2 figures published for the 252 hp version.
Our exhaust systems work perfectly with or without an ECU remap. On your BMW X4 G02, however, we recommend having it done at an approved tuning centre: it is what lets the engine reach its full potential.
The B48 takes well to tuning, and the X4 has a reserve that a Stage 2 remap can exploit by working on boost pressure, with a suitable front section. Results depend on the starting version and the condition of the engine; the ROG exhaust forms a coherent basis for this approach.
Configuring your exhaust, step by step
4 choices, in the same order as the product page configurator.
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Step 1 of 4: Material: stainless steel or titanium
For your BMW X4 G02, the exhaust costs €2,490 in stainless steel and €2,990 in titanium.
304 stainless steel
2 490 €
- 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
2 990 €
- 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.
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Step 2 of 4: Front section: downpipe and catalytic converter
Optional: the downpipe on your BMW X4 G02, 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
+750 €
8/10Road use and French MOT
Emissions control is still very much there, and flow improves noticeably. The choice for everyday driving.
100-cell sports catalytic converter
+750 €
9/10French MOT pass not guaranteed
Half as many cells: flow comes close to a decat and the sound gains real aggression at high revs.
Decat
+500 €
10/10Track use only
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? A sports catalytic converter can trigger it: the oxygen sensor after the catalytic converter detects less cleaning than with the factory unit. It is not a fault. An ECU remap recalibrates the sensor, and a session with a diagnostic tool clears the fault code. With a decat, the warning light is almost certain without a remap. If it happens to you, call us and we will point you in the right direction. Passing the French MOT with a sports exhaust.
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Step 3 of 4: Valves: ROG remote or factory control
Two ways to control the valves on your BMW X4 G02.
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.
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Step 4 of 4: Tips: the visual signature
Match the tips to the style of your BMW X4 G02, understated or bold. A particular finish in mind? Send us a photo and we will look at it together.
- Stainless steel
- Black
- Carbon
- Blued titanium
- M Performance style carbon
The ROG sound signature on the B48 of the X4 G02
The B48 sounds richer than you would expect from a four-cylinder: a muffled bass at idle, then a gravelly grain that hardens under acceleration. On the X4, the factory exhaust reduces all of this to a flat background noise, at odds with the coupé SUV looks you chose.
Once the ROG exhaust is fitted, with the valves open, the X4 gains a real signature: a rounder bass at start-up, pick-up you can hear, and a presence that matches its style. With the valves closed, the car stays as hushed as it was from the factory, ideal for long journeys and town driving alike.
From order to fitting
-
Configuration
You choose your exhaust and enter your VIN, found in box E of your registration certificate.
-
Check
We check compatibility with your VIN before manufacturing begins.
-
Manufacturing
Your exhaust is made to order, for your car.
-
Delivery
Free in Europe, 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 delivery
- Payment
- In instalments with Klarna
- Installation
- At the garage of your choice
What about the manufacturer's warranty on your BMW X4 G02? 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 comes from that part. Our article on the manufacturer's warranty.
Our recommendations for your BMW X4 G02
-
Daily driving
2 490 €
- Stainless
- Cat-back only
- ROG remote
Your BMW X4 G02 stays easy to live with, the factory emissions control is retained, and you open the valves whenever you decide.
View this configuration -
Fast road
3 740 €
- Titanium
- 200-cell downpipe
- ECU remap
More sound, more breathing, and a car you can still present at the French MOT.
View this configuration -
Track
3 490 €
- 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 the phone.
BMW X4 G02: your questions
How much power does an exhaust add on the BMW X4 G02?
As standard, the BMW X4 G02 produces 184 to 252 hp and 290 to 350 Nm, depending on the version. 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 for the 252 hp version reach 310 hp and 480 Nm.
Stainless steel or titanium: which material for the BMW X4 G02?
For the BMW X4 G02, the ROG exhaust costs €2,490 in stainless steel and €2,990 in titanium. 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 X4 G02?
No. On the BMW X4 G02, 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.
Can the BMW X4 G02 pass the French MOT with a ROG exhaust?
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 converter no longer guarantees a pass, and the decat fails the emissions test.
How is the ROG exhaust fitted on the BMW X4 G02?
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 price and lead time for a ROG exhaust on the BMW X4 G02?
From €2,490 to €3,740 depending on the configuration. Allow 20 working days from order confirmation to delivery. Free delivery in Europe and a 3-year warranty.
Unsure about your configuration? Give us a call.
Stainless steel or titanium, cat-back only or the complete system: the right choice depends on how you drive and on your BMW X4 G02. We take the time to talk it through before you order, with a reply within 24 hours. We are not here to sell to you over the phone: we help you choose, even if that means a cheaper option because it suits the way you drive.
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
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