Ford Mustang EcoBoost S550: the four-cylinder Mustang, the exhaust system guide

The 2.3-litre EcoBoost: the turbocharged four-cylinder of the Mustang S550

The Mustang's EcoBoost is a 2.3-litre aluminium inline four-cylinder with direct injection and a twin-scroll turbo. From 2015 to 2017, it produces 317 hp and 434 Nm; after the facelift, from 2018 to 2022, it is rated at 290 hp and 440 Nm, with torque still strong from low revs. Enough to put the rear axle to work with real ease.

The engine and body change little from one period to the other, which allows a single Rog exhaust to suit both. On a turbocharged four-cylinder, the turbine already absorbs part of the pulses, and the factory exhaust finishes the job: the Mustang accelerates hard but its voice stays flat. The Rog exhaust gives the 2.3-litre a freer path that brings out its raspy grain, without touching the engine or the ECU.

What makes up the exhaust on your Ford Mustang EcoBoost S550

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

Your Ford Mustang EcoBoost S550 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 Ford Mustang EcoBoost S550, and that is what we recommend.

In the first period, the EcoBoost is quoted at 357 hp and 546 Nm at Stage 2, a result that depends on the condition of the car and on the tuner. Torque is the big winner with this kind of tuning. The Rog exhaust, for its part, claims no gain and takes care of giving the tuned engine a more candid voice.

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 Ford Mustang EcoBoost S550, 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 Ford Mustang EcoBoost S550.

   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 Ford Mustang EcoBoost S550, understated or bold. A particular finish in mind? Send us a photo and we will look at it together.

   • Chrome
   • Gloss black
   • Blued titanium

   

The Rog sound signature on the Mustang EcoBoost

Set free, the EcoBoost growls with a raspy, gritty tone, unexpected from a four-cylinder, with the rush of the turbo mixing in under load. The factory exhaust turns it into a neutral purr, far from the Mustang's image and the real temperament of its engine.

With the valves open, the Rog exhaust gives the Mustang a full, aggressive voice, with acceleration you can hear and deceleration punctuated by crackles. With the valves closed, it regains a composed sound, for town and long stretches.

From order to fitting

1. Configuration

   You choose the options for your Ford Mustang EcoBoost S550 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 Ford Mustang EcoBoost S550.

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 Ford Mustang EcoBoost S550

• Daily driving

  • Stainless
  • Cat-back only
  • Rog remote

  Your Ford Mustang EcoBoost S550 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.

Ford Mustang EcoBoost S550: your questions

Further reading

• All Ford exhaust systems
• Ford Mustang GT S550 V8 5.0
• Ford Focus RS Mk3 2.3 EcoBoost
• Stage 2: the role of the downpipe
• How to pass vehicle inspection with a modified exhaust
• Pop & Bang: how it works, and is it risky?
• Stainless steel or titanium: what really changes
• The 28 brands we cover