BMW B58 Downpipe, 4.5" Stainless Steel for M240i, 340i, 440i, 540i

This BMW B58 downpipe is a 4.5 inch stainless steel replacement for the 3.0 litre turbocharged inline six in the 2016-2020 M240i, 340i, 440i and 540i. It replaces the factory downpipe after the turbo and is a common first step for owners tuning the B58. It is made for cars without a petrol particulate filter (non-OPF) only.

Specifications

• Engine: BMW B58 3.0T inline six
• Material: stainless steel
• Size: 4.5 inch, 114 mm / 80 mm
• Catalytic converter: not included
• Parcel size: 67 x 22 x 15 cm, weight 3.2 kg

Fitment

• M240i F22, F23
• 340i F30, F31, F34
• 440i F32 coupe, F33 convertible, F36
• 540i G30, G31

It does not fit the N55, N54 or B48 engines, or regional special editions with a factory-integrated front catalyst shell.

Before you buy

A downpipe without a catalytic converter is normally sold for off-road and competition use. Road rules on emissions and noise vary a lot between countries, so check what is allowed where you drive. Most cars also need a tune after fitting to avoid warning lights. For how turbo exhaust systems work, see the turbocharger article on Wikipedia.

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