Valved Exhaust System for BMW Z4 G29 B48 2.0T (2019-2022)
Configuration
BMW Z4 G29 2.0T Valved Exhaust System (2019-2022)
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 Z4 G29 2.0T exhaust in detail.
The Z4 sDrive20i and sDrive30i share the M40i’s sharp chassis with the B48, a 2.0-litre turbocharged four-cylinder: 197 hp and 320 Nm for the 20i, 258 hp and 400 Nm for the 30i. A light, agile roadster, covered here from 2019 to 2022. The six-cylinder Z4 M40i G29 has its own page, as does the previous-generation Z4 E89 2.0T.
With the roof open, you hear the wind more than the engine: BMW tuned the B48 for efficiency and silence, and its factory voice is almost non-existent. Yet this is the type of car an exhaust transforms the most. With the valves open, our cat-back gives the four-cylinder a full, sporty tone, with crisp crackles on lift-off, without chasing volume at all costs; with the valves closed, the roadster becomes completely discreet again.
The system, bent to your VIN, connects without welding using clamps and gaskets in about two hours; the valves stay controlled by the factory driving modes or by the Rog remote.
The “Manifold” option sells the B48’s downpipe; on its own, it only changes the sound and slightly the weight, and it is a map that turns it into power. On a recent roadster, the 200-cell downpipe is the most widespread, since it maintains 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, around 40% lighter, suits such a light roadster well.
BMW Z4 G29 2.0T exhaust specifications.
| System type | Valved cat-back (valve exhaust), built to your VIN |
|---|---|
| Vehicle and chassis code | BMW Z4 G29 roadster, sDrive20i and sDrive30i |
| Engine | B48, 2.0-litre turbocharged four-cylinder, 197 hp / 320 Nm or 258 hp / 400 Nm |
| Years | 2019-2022 |
| Materials and finishes | 304 stainless steel or titanium; titanium in brushed, gold or purple |
| Valves | Factory drive modes or the Rog remote |
| Front section (option) | Downpipe with 200-cell or 100-cell catalytic converter, 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 Z4 G29 2.0T exhaust.
Can a 2023 or newer Z4 G29 take this exhaust?
Our page lists 2019 to 2022 and does not document 2018 or 2023 to 2026; send us your roadster’s VIN and we check compatibility before building.
sDrive20i or sDrive30i: what does an ECU remap give?
The page publishes Stage 2 figures of 310 hp and 460 Nm for the 20i, and 340 hp and 510 Nm for the 30i, with downpipe and a map by an approved tuner; the cat-back on its own works without them.
Should the roof be raised and the valves closed on the Z4 G29 before the vehicle inspection?
That is the best way to present it: roof up, valves closed, the B48 sounds as it did on delivery, and the original catalytic converter or the one in the 200-cell downpipe stays active; 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.
Roof open, does the modified Z4 finally drown out the wind noise?
With the valves open, yes: the B48 takes on a full voice that accompanies your driving; with the valves closed, the roadster stays as discreet as stock.
Will the Z4 G29’s Sport button still control the valves?
If your roadster has factory valves, yes, the drive modes stay in control; otherwise, a box hidden behind the seats and the Rog remote take over.
BMW Z4 G29 2.0T: 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 Z4 G29 2.0T: 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 Z4 G29 (20i / 30i): the complete exhaust system guide
The Z4 sDrive20i and 30i share the sharp chassis of the M40i, with the B48 four-cylinder engine. An agile, lightweight roadster, but with an almost non-existent factory voice: with the roof down, you hear the wind more than the engine....
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.
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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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