Valved Exhaust System for BMW 230i B48 G42 2.0L (2022+)
Configuration
BMW 230i B48 G42 Valved Exhaust System (2022+)
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 230i G42 exhaust in detail.
The 230i G42 embodies the new generation of 2 Series coupé: compact size, a lively chassis and a 2.0-litre turbo B48 delivering 245 hp and 400 Nm, with torque available very early. This page covers the 220i and 230i G42 with the B48 engine built since 2022, which take the same system; the six-cylinder M240i G42 has its own page.
The B48 has a more muscular voice than its displacement suggests: a muffled note at idle, a drier grain under acceleration, a slight turbo whistle in the background. The factory exhaust smooths all this into a neutral breath. Once the valves are open, our valved cat-back gives the four-cylinder a full sound that accompanies every climb through the revs; closed, they leave the 230i hushed, in town and on the motorway alike.
On this recent coupé, installation remains simple: not a single weld, clamps and gaskets, about two hours, and a 230i delivered with factory valves keeps obeying its drive modes, while the others receive the Rog remote and its box in the boot.
For the front section, the “Manifold” option on this turbocharged engine refers to the catalysed downpipe; with the standard map, it adds voice and takes off a little weight, without extra power. A 200-cell sports catalytic converter maintains the B48’s emissions control, a 100-cell is accepted or not depending on the vehicle and your country’s rules, and the decat version is reserved for track use. For a new or nearly new 230i, 304 stainless steel is the natural choice, titanium around 40% lighter the distinctive touch, in brushed, gold or purple.
BMW 230i B48 G42 2.0L exhaust specifications.
| System type | Valved cat-back (valve exhaust), built to your VIN |
|---|---|
| Vehicle and chassis code | BMW 230i G42 coupé |
| Engine | B48, 2.0-litre turbocharged four-cylinder, 245 hp and 400 Nm |
| Years | 2022+ |
| 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) | Downpipe with 200-cell or 100-cell catalytic converter, or decat |
| Fitting | No welding or cutting, about 2 hours |
| Manufacturing and delivery | Made to order, 20 working days, free delivery |
| Warranty | 3 years, parts and workmanship |
Questions about the BMW 230i B48 G42 2.0L exhaust.
Can an older 230i G42, from 2022 for example, be equipped?
Yes. The 220i and 230i G42 with the B48 engine built since 2022 take the same Rog system. Your VIN is only used to confirm the model year before manufacturing.
What does an ECU remap bring on the 230i G42?
The coupé goes from 245 hp and 400 Nm to 340 hp and 510 Nm according to the published Stage 2 figures, provided you add the downpipe and entrust the map to an approved tuning centre; for the cat-back alone, no electronic work is required.
Vehicle inspection: which 230i configuration should be presented?
The simplest: cat-back only or 200-cell downpipe, valves closed, for a coupé that keeps its emissions control and a sound close to stock; in 100-cell form, the coupé is accepted or not depending on the vehicle and your country’s rules, and the decat version is reserved for track use.
At 130 km/h, will the 230i resonate?
No: with the valves closed, the gases run through the silencer designed for cruising and the coupé stays composed on the motorway; you only open the valves when you feel like it.
Which material suits the 230i best?
304 stainless steel remains the safe choice, robust and round in tone; titanium lightens the system by around 40% for the same design and brightens the note, with three possible finishes.
BMW 230i B48 G42 2.0L: 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 230i B48 G42 2.0L: 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 230i B48 G42: the small coupé that raises its voice, the exhaust system guide
The 230i G42 embodies the new generation of the 2 Series coupé: compact dimensions, a lively chassis and a 2.0-litre turbocharged four-cylinder that pulls hard from low revs. The engine is responsive, but the factory exhaust confines it to a...
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.
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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.
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