Valved Exhaust System for BMW Z4 E89 N20 2.0T (2011-2016)
Configuration
BMW Z4 E89 2.0T Valved Exhaust System (2011-2016)
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 E89 2.0T exhaust in detail.
A rear-wheel-drive roadster with a retractable hard top, the Z4 E89 2.0T from 2011 to 2016 relies on the N20, a 2.0-litre four-cylinder with a twin-scroll turbo, offered in three power outputs: 156 hp and 240 Nm in sDrive18i form, 184 hp and 270 Nm in sDrive20i form, 245 hp and 350 Nm in sDrive28i form. Its torque arrives early and gives strong pick-up without having to thrash it. The six-cylinder Z4 E89 models have their own pages.
With the roof folded, however, it is the wind that dominates: the factory exhaust makes the N20 almost mute, even though it has more depth than you would expect from a four-cylinder, with a muffled note low down and a sportier grain as it climbs. With the valves open, our cat-back gives the Z4 a full sound that accompanies it on a winding road; closed, they keep it discreet in town as on the motorway.
Nothing to cut under this roadster: the system, bent specifically for it to its VIN, is assembled with clamps and gaskets in a morning, and the Rog remote replaces the factory control if the Z4 has no factory valves.
The “Manifold” option sells the N20’s downpipe; without an ECU remap, it adds a little voice and removes a few kilos, and only with a map does it release power. With the 200-cell downpipe, the Z4’s four-cylinder continues to control its emissions; 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. As for material, 304 stainless steel or titanium around 40% lighter, from brushed to purple.
BMW Z4 E89 2.0T exhaust specifications.
| System type | Valved cat-back (valve exhaust), built to your VIN |
|---|---|
| Vehicle and chassis code | BMW Z4 E89 roadster, sDrive18i, sDrive20i and sDrive28i |
| Engine | N20, 2.0-litre turbocharged four-cylinder, 156 to 245 hp and 240 to 350 Nm depending on the version |
| Years | 2011-2016 |
| 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 | 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 E89 2.0T exhaust.
sDrive18i, 20i or 28i: are all Z4 E89 2.0Ts covered?
Yes, all three N20 power outputs are listed on the page, from 2011 to 2016, without being distinguished; your VIN confirms the version before manufacturing.
Does a Z4 E89’s N20 respond well to an ECU remap?
The page publishes 280 hp and 450 Nm for the sDrive18i and sDrive20i, 310 hp and 440 Nm for the sDrive28i, with downpipe and a map by an approved tuner; the cat-back on its own does not need them.
BMW Z4 E89 N20 2.0T with a Rog exhaust: what should you know about vehicle inspection?
Roof closed, valves shut and catalytic converter in place, original or on the 200-cell downpipe, the small roadster presents as new; with 100 cells, acceptance depends on the car and the rules in your country, and the decat version is reserved for track use.
Can a roadster four-cylinder really sing?
The N20 has a muffled note and a sporty grain that the wind covers from the factory; with the valves open, our system brings them to the fore, roof down.
Stainless steel or titanium for a Z4 driven mostly in summer?
304 stainless steel is robust and full-sounding; titanium is around 40% lighter for the same design and brightens the note, with three colours to choose from.
BMW Z4 E89 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 E89 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 E89: the turbo roadster finds its voice, the exhaust system guide
A rear-wheel-drive roadster with a retractable hard top, the Z4 E89 in 2.0T form relies on the N20, a lively, torquey turbocharged four-cylinder. With the roof folded, though, it is the wind that dominates: the factory exhaust makes 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
Your country
Rog in the UK.
The MOT and your exhaust
At the MOT, exhaust noise is judged by ear, with no sound meter: valves closed, your car sounds very close to stock. A cat-back leaves your factory cat and sensors untouched, a 200-cell sports cat keeps emissions control, and the MOT tester decides.
On the road
Valves closed around town, your car sounds very close to stock, and you open them whenever you like. Where councils use noise cameras, they target behaviour such as revving and racing.
Your documents
Each system is built from the VIN on your V5C, and an exhaust isn't one of the changes you record on it. We send the technical documentation free on request, for the MOT or for your insurer.
Your insurance
Insurers usually want to know about modifications, so let yours know: our free technical documentation makes it easy.
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.
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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.
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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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