BMW 335i N54 E90 / E91 / E92 / E93: the tuners' twin-turbo, the exhaust guide

The N54: two turbos serving the inline-six

The N54 is a 3.0-liter direct-injection inline-six, fed by two small turbos that each serve three cylinders. In the 335i, it is rated at 306 hp and 400 Nm, with torque that arrives early and holds on for a long time. This layout gives a sharp, almost lag-free response and a flexibility that makes you forget the turbocharging. On the E90, E92 and E93, it makes the 335i a car that is both fast and easy to drive.

The two turbos already act as a first muffler, and the 335i's factory exhaust adds on top of that volumes designed for comfort. The result: a straight-six renowned for its sound remains barely audible. The Rog valved exhaust replaces this rear section, with the engine and ECU left as they are, and gives you the choice between factory discretion and a voice worthy of the N54.

What makes up the exhaust on your BMW 335i N54 E90 / E91 / E92 / E93

An exhaust system is best understood in two parts. Here is what each one does, and what Rog replaces.

Your BMW 335i N54 E90 / E91 / E92 / E93 in figures

What an exhaust changes straight away is the sound, the engine's breathing and the weight at the rear. For more power, add an ECU remap.

Published factory and Stage 2 figures.

With or without an ECU remap, the exhaust fits and works. But it is an ECU remap at an approved tuning center that truly unlocks your BMW 335i N54 E90 / E91 / E92 / E93, and that is what we recommend.

The N54 owes much of its reputation to the margin it leaves for tuners. At Stage 2, the quoted figures are around 380 hp and 540 Nm, provided you start from an engine in good condition and entrust the work to a specialist. The Rog exhaust goes along with this approach without claiming any of the horsepower.

Configuring your exhaust, step by step

4 choices, in the same order as the product page configurator.

1. 1

   Step 1 of 4: 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

   Durable, corrosion-resistant, with a rounded, full sound: the most popular option.

   Titanium

   Weight

   Around 40% lighter

   Sound

   Metallic, crystal-clear

   For the same design, it weighs around 40% less than stainless steel. A more metallic note at high revs and a look all of its own, from brushed to blued.

   Both materials age well: 304 stainless steel copes with winter and salt, and titanium does not rust. Stainless steel or titanium: what really changes.

2. 2

   Step 2 of 4: Front section: downpipe and catalytic converter

   Optional: the downpipe on your BMW 335i N54 E90 / E91 / E92 / E93, with its catalytic converter. Sound rating out of 10, valves open: the factory exhaust sits at 3.

   Cat-back only

   Included

   7/10

   Factory emissions control

   Nothing changes at the front: the cat-back alone is already enough to change the car.

   200-cell sports catalytic converter

   8/10

   Road use and inspection

   The everyday compromise: emissions control is still there, and breathing improves noticeably.

   100-cell sports catalytic converter

   9/10

   Inspection: depends on local rules

   One step further: more flow, a more aggressive sound, reduced emissions control.

   Decat

   10/10

   Track use

   Everything unleashed: maximum flow and unrestrained sound, for the track.

   Sound intensity, on a scale of 0 to 10

   1. 10/10Decat downpipe + Rog cat-back
   2. 9/10100-cell sports catalytic converter + Rog cat-back
   3. 8/10200-cell sports catalytic converter + Rog cat-back
   4. 7/10Rog cat-back only, factory catalytic converter retained
   5. 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.

3. 3

   Step 3 of 4: Valves: Rog remote or factory control

   Two ways to control the valves on your BMW 335i N54 E90 / E91 / E92 / E93.

   Rog remote

   

   The simplest solution: a control unit in the trunk and a remote, open or closed at the press of a button, whatever mode you are in. A question while fitting? We will get back to you.

   Factory control

   • Only for vehicles fitted with factory valves
   • Controlled by the drive modes

   Does your vehicle have factory valves? The exhaust keeps their existing control: the drive modes operate the valves, as before, with no added electronics.

   On a long journey, what matters is the absence of drone at a steady speed. With the valves closed, the exhaust keeps the cabin calm; the show is still there whenever you ask for it. More about exhaust drone.

4. 4

   Step 4 of 4: Tips: the visual signature

   Match the tips to the style of your BMW 335i N54 E90 / E91 / E92 / E93, 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 N54 six-cylinder

An inline-six has one of the most balanced voices there is: even, free of harshness, with a very linear rise in pitch. On the N54, the whoosh of the two turbos is added to the mix. The 335i's factory exhaust lets almost none of this blend through, even though it is what gives the engine all its charm.

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.

With the Rog exhaust and the valves open, the N54 recovers its straight-six sound, hushed at idle and then more and more metallic as the needle climbs. With the valves closed, the 335i remains an everyday car, discreet at start-up and on long journeys alike.

From order to fitting

1. Configuration

   You choose the options for your BMW 335i N54 E90 / E91 / E92 / E93 and enter its VIN, found in box E of the registration document or at the base of the windshield.

2. Check

   We confirm compatibility with your car before we build it.

3. Manufacturing

   Made to order, for your BMW 335i N54 E90 / E91 / E92 / E93.

4. Delivery

   Free, insured delivery, with tracking sent on dispatch.

5. Fitting

   Clamps and gaskets, no welding: two hours on average at the garage of your choice.

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? In Europe, fitting a part from another brand is not enough on its own to void it; the manufacturer has to prove the link between that part and the fault. Our article on the manufacturer's warranty.

Our recommendations for your BMW 335i N54 E90 / E91 / E92 / E93

• Daily driving

  • Stainless
  • Cat-back only
  • Rog remote

  Your BMW 335i N54 E90 / E91 / E92 / E93 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

  For great roads: more voice and more response, while staying road-friendly.

  View this configuration

• Track

  • Titanium
  • Decat downpipe
  • Stage 2

  The most extreme configuration, for track use only.

  View this configuration

These profiles are starting points. The right choice is often made in a few messages.

BMW 335i N54 E90 / E91 / E92 / E93: your questions

Further reading

• All BMW exhaust systems
• BMW 335i N55 E90 / E91 / E92 / E93 3.0T
• BMW 325i / 330i N52 E90 / E91 / E92 / E93
• BMW M3 E90 / E92 / E93 4.0L
• Stage 2: the role of the downpipe
• How to pass vehicle inspection with a modified exhaust
• Exhaust resonator: what does it do?
• The 28 brands we cover