Home Makes BMW B48

BMW B48 Exhaust and Downpipe (M135i, 230i, 320i, 330i, 430i, Z4, Mini JCW, Supra 2.0)

Valved exhaust systems and downpipes for the B48 four-cylinder: BMWs from the M135i to the Z4, the Mini John Cooper Works and the Toyota GR Supra 2.0. Made to order from your VIN, with free delivery.

BMW B48

The B48 at a glance.

The B48 is BMW's 2.0-litre turbocharged four-cylinder, which arrived in 2014 under the hood of the Mini Cooper S F56 before spreading across the BMW range. It displaces 1,998 cc and combines a twin-scroll turbo with direct injection. It belongs to BMW's modular engine family of 500 cc per cylinder: it is the four-cylinder cousin of the B58, built on the same base, with the same eager response from low revs. You will find it in BMWs, the Mini John Cooper Works and the Toyota GR Supra 2.0.

Depending on the model, BMW quotes from 184 hp (320i, 220i, 320i GT) to 306 hp and 450 Nm on the M135i xDrive F40. In between: 231 hp on the Mini John Cooper Works F56, 245 hp on the 230i and 430i G42 / G22, 252 hp on the 430i F32, 530i, X3 and X4, and 258 hp on the GR Supra 2.0.

Models covered.

Rog makes a system for each of these B48 versions:

Each model also has its own page, with all its versions: for example the 3 Series G20 / G21, the 2 Series G42 or the GR Supra A90.

The sound of the B48.

A turbocharged four-cylinder sounds drier than a six, and the B48's standard exhaust, designed for silence, leaves it almost nothing. That is exactly where an exhaust transforms the car the most. With the valves closed, a Rog system stays close to standard and the cabin stays quiet on the highway. With the valves open, the B48 gains volume and roundness: a deep, full note at low revs, angrier as the revs climb, with the whoosh of the turbo easier to hear.

What the Rog system changes.

The Rog system replaces everything after the catalytic converter, right up to the tailpipes (the cat-back):

  • Adjustable sound: valves closed for everyday driving and long journeys, open when you want to hear it. The system takes your original valves or comes with the Rog valve system and its remote control.
  • Two materials: 304 stainless steel, or titanium, around 40 % lighter for the same design, in a brushed, gold or purple finish.
  • The character of the sound: on BMWs, straight pipe, or resonator for a rounder, slightly softer voice that is just as sporty.
  • The original ECU: on a B48, the cat-back alone needs no remap.

What the downpipe changes.

On the B48, the downpipe is the pipe that leaves the turbo and carries the original catalytic converter. It is the part that restricts the exhaust gases the most: replacing it makes the engine more present and the turbo 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.

On most B48 models, 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: the B48 replaced the N20 partway through production on several models, and the VIN 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, on the most powerful B48 model: our BMW M135i F40 guide.

Frequently asked questions.

Which cars have the B48 engine?

At Rog: many BMW 2.0 turbo models, from the M135i F40 to the Z4 G29, the Mini John Cooper Works F56 / F57 and the Toyota GR Supra 2.0. The full list is above; your VIN confirms the engine.

Can a four-cylinder really sound good?

Yes, and it is often on these engines that you hear the biggest difference, because the standard exhaust muffles them heavily. With the valves open, the B48 gains a deep, round note; with the valves closed, it stays discreet.

Does a B48 need a remap after an exhaust or a downpipe?

Not for the cat-back alone: the engine 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.

Will the exhaust from a 330i fit a Supra 2.0 or a Mini?

No: these cars share the engine, not the underbody. Each Rog system follows the layout of its own model; choose your car's product page from the list above, and the VIN does the rest.

Your model is not in this list? Write to us