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BMW S55 Exhaust and Downpipe (M3 F80, M4 F82 / F83, M2 Competition)

Valved exhaust systems and downpipes for the S55 twin-turbo straight six in the BMW M3 F80, M4 F82 / F83 and M2 Competition F87. Made to order from your VIN, with free delivery.

BMW S55

The S55 at a glance.

The S55 is BMW M's 3.0-litre twin-turbo straight six, introduced in 2014 on the M3 F80 and M4 F82, then adopted in 2018 by the M2 Competition F87. It displaces 2,979 cc and pairs two single-scroll turbos, one for each group of three cylinders, with a closed deck block designed to withstand high boost pressures. It was the first turbocharged straight six in the M3 and M4, and it is an engine that takes very well to tuning.

BMW quotes 431 hp and 550 Nm for the M3 and M4 F80 / F82 / F83, 450 hp with the Competition package, and 410 hp and 550 Nm for the M2 Competition. With a downpipe and a remap, our M3 / M4 F80 and M2 Competition product pages list a Stage 2 at 530 hp and 720 Nm.

Models covered.

Rog makes a system for each of these S55 versions:

Each model also has its own page, with all its options: the M3 / M4 F80 and the M2 F87. The 2016 to 2018 M2 has the N55: see our BMW N55 page. The later M3 and M4 have the S58: see our BMW S58 page.

The sound of the S55.

The S55 has a metallic, snarling voice, rawer than that of its successors, but the original exhaust keeps most of it to itself, and BMW tops up its sound in the cabin through the speakers. With the valves closed, a Rog system stays close to the original sound and the cabin remains calm on the highway. With the valves open, the straight six gets all its bite back, from a deep growl at low revs all the way to the rev limiter.

What the Rog system changes.

A valved cat-back exhaust that you configure piece by piece:

  • Three designs: Standard, Equal Length, or Equal Length + Z-pipe, the most refined system we make. Standard keeps the raw edge of the twin-turbo; Equal Length gives every pipe the same length, so the exhaust pulses fall into step and the note climbs, smoother and less raspy; the Z-pipe pushes it towards an exotic, high-pitched wail at high revs.
  • Two materials: 304 stainless steel, or titanium, around 40% lighter for the same design, in a brushed, gold or purple finish.
  • Sound character: straight pipe, or a resonator for a rounder, slightly softer voice that stays every bit as sporty.
  • The valves: the system takes your original valves or comes with the Rog valve system and its remote control.

What the downpipe changes.

On the S55, the downpipe is the section that follows the turbos and carries the original catalytic converters. It is the part that restricts the exhaust gases the most: replacing it makes the engine more present and the turbos more audible, and it is what opens the way to power gains, with a remap. Without a remap, it brings sound and less weight, not extra horsepower.

Rog offers it in three versions: 200-cell sports catalytic converter, 100-cell sports catalytic converter, or decat. The 200-cell version keeps emissions control; the 100-cell and decat versions do not. You can order it with the system, in the configuration on your product page, or on its own when it appears in the list on this page.

Made for your car.

Every Rog system and downpipe is made to order from your car's VIN, which confirms the engine and compatibility before production. Allow 20 working days from confirmation to delivery, with free delivery and a 3-year warranty on parts and workmanship. Fitting is done at the workshop of your choice. We have been producing for more than 15 years.

Sound, options and fitting in detail: our BMW M3 and M4 F80 guide and our BMW M2 Competition guide.

Frequently asked questions.

Which cars have the S55 engine?

The BMW M3 F80, M4 F82 and F83, Competition included, and the M2 Competition F87. The 2016 to 2018 M2 has the N55. Your VIN, given when you order, confirms the engine.

Standard, Equal Length or Equal Length + Z-pipe: which is right for the S55?

Standard for a raw, full-bodied sound. Equal Length for a higher-pitched, smoother straight six: it is the option that changes the car's character the most. Equal Length + Z-pipe for the highest, most exotic note.

Does an S55 need a remap after an exhaust or a downpipe?

Not for the cat-back alone: the S55 keeps its original ECU. With the downpipe, a remap is recommended: it is what unlocks the power, and it stops a sports catalytic converter from triggering the engine warning light.

200-cell, 100-cell or decat: which should I choose?

The 200-cell version keeps emissions control and already gives a more present sound. The 100-cell version lets the gases flow more freely. The decat version is the freest flowing and the loudest of the three.

Original valves or the Rog remote?

With your original valves, the BMW's drive modes open and close them, just as before. With the Rog system, the remote opens or closes them at the touch of a button, whatever mode you are in.

Your model is not in this list? Write to us