BMW 435i and 440i F32 / F33 / F36: from the N55 to the B58, the exhaust system guide

N55 and B58: two inline-sixes for the 4 Series F32, F33 and F36

The 435i gets the N55, a 3.0-litre direct-injection inline-six boosted by a single twin-scroll turbo: 306 hp and 400 Nm. In the 440i, the more modern B58 keeps the displacement and principle but pushes to 326 hp and 450 Nm, with torque arriving even earlier. Both share the smoothness and the reach to the redline that have made BMW's inline-sixes famous.

Same body, same displacement, same architecture: the Rog exhaust suits the N55 and the B58 equally well, on all three body styles. On these engines, the factory exhaust is designed so that you do not hear the six-cylinder, which is a shame on a car so focused on enjoyment. The Rog exhaust brings the engine to the fore when you open the valves, and lets you forget it when you close them.

What makes up the exhaust on your BMW 435i F32 / F33 / F36 or 440i F32 / F33 / F36

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

Your BMW 435i F32 / F33 / F36 or 440i F32 / F33 / F36 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 centre that truly unlocks your BMW 435i F32 / F33 / F36 or 440i F32 / F33 / F36, and that is what we recommend.

Both engines respond well to an ECU remap. At Stage 2, the 435i is quoted at 368 hp and 557 Nm and the 440i at 440 hp and 620 Nm, the B58 having more headroom. The real result depends on each car and on the tuner; the Rog exhaust does not touch the ECU and is devoted to the sound.

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

   Baseline

   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 435i F32 / F33 / F36 or 440i F32 / F33 / F36, 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 435i F32 / F33 / F36 or 440i F32 / F33 / F36.

   Rog remote

   

   The simplest solution: a control unit in the boot 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 435i F32 / F33 / F36 or 440i F32 / F33 / F36, understated or bold. A particular finish in mind? Send us a photo and we will look at it together.

   • Chrome
   • Gloss black
   • Blued titanium
   • M Performance Carbon Black
   • M Performance Carbon Titanium
   • M Performance Carbon Forged

   

The Rog sound signature on the six-cylinders of the 435i and 440i

The N55 sings with a round, continuous voice; the B58, slightly raspier, gains bite at full load. Both have the smoothness typical of inline-sixes, with no vibration or jerkiness. Behind the 4 Series' factory exhaust, this song stays confined under the bonnet, far from what a coupé of this standing promises.

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 valves open, the Rog exhaust lets you hear the six-cylinder from start to finish: a muted rumble at idle, a silky climb, crackles on the overrun. With the valves closed, your 435i or 440i becomes a discreet grand tourer again, one you never tire of taking on a trip.

From order to fitting

1. Configuration

   You choose the options for your BMW 435i F32 / F33 / F36 or 440i F32 / F33 / F36 and enter its VIN, found in box E of the registration document or at the base of the windscreen.

2. Check

   We confirm compatibility with your car before we build it.

3. Manufacturing

   Made to order, for your BMW 435i F32 / F33 / F36 or 440i F32 / F33 / F36.

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 435i F32 / F33 / F36 or 440i F32 / F33 / F36

• Daily driving

  • Stainless
  • Cat-back only
  • Rog remote

  Your BMW 435i F32 / F33 / F36 or 440i F32 / F33 / F36 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 435i F32 / F33 / F36 or 440i F32 / F33 / F36: your questions

Further reading

• All BMW exhaust systems
• BMW 430i B48 F32 2.0T
• BMW 135i E82
• BMW 335i F30 3.0T
• 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