Fits 2019–2027 M340i (G20/G21)

M340i (G20/G21) EXHAUSTS

Shop all 20 parts
UK fittingR44 HQ, Wembley
Express deliveryUK & worldwide
Rated 4.7 starsBy our customers

M340i (G20/G21) Exhaust Systems20 products

20 products
Sort by
Sort by
Save £76.86
Scorpion Exhaust GPF Delete Exhaust Midpipe For BMW G20 M340i xDrive Scorpion Exhaust GPF Delete Exhaust Midpipe For BMW G20 M340i xDrive
Scorpion ExhaustsScorpion Exhaust GPF Delete Exhaust Midpipe For BMW G20 M340i xDrive
£307.44GBP £384.30GBP
Save £202.91
Scorpion GPF Back Exhaust System For BMW G20 M340i xDrive Scorpion GPF Back Exhaust System For BMW G20 M340i xDrive
Scorpion ExhaustsScorpion GPF Back Exhaust System For BMW G20 M340i xDrive
From £811.64GBP £1,014.55GBP
Leib BMW G Series & F Series CAN MIL Delete Module For OPF & Cat Errors
LEIB EngineeringLeib BMW G Series & F Series CAN MIL Delete Module For OPF & Cat Errors
£359.99GBP
Leib BMW B58 OPF Delete Cables (F20/F22/F30/F32/G20/G22/G42)-R44 Performance
LEIB EngineeringLeib BMW B58 OPF Delete Cable (F20/F22/F30/F32/G20/G22/G42)
£179.99GBP
Akrapovic BMW M340i & M440i Stainless Steel Exhaust Link Pipe Set (G20, G21, G22, G23 & G26)
AkrapovicAkrapovic BMW M340i & M440i Stainless Steel Exhaust Link Pipe Set (G20, G21, G22, G23 & G26)
£1,365.41GBP
Save £121.28
Scorpion BMW G29 Z4 M40i, G20 M340i, G42 M240i & Toyota GR Supra 3.0 High Flow Sports Cat Downpipe Scorpion BMW G29 Z4 M40i, G20 M340i, G42 M240i & Toyota GR Supra 3.0 High Flow Sports Cat Downpipe
Scorpion ExhaustsScorpion BMW G29 Z4 M40i, G20 M340i, G42 M240i & Toyota GR Supra 3.0 High Flow Sports Cat Downpipe
£485.10GBP £606.38GBP
Remus BMW M340i/M440i xDrive Axle-Back System (G20/G22)-R44 Performance Remus BMW M340i/M440i xDrive Axle-Back System (G20/G22)-R44 Performance
RemusRemus BMW M340i/M440i xDrive Axle-Back System (G20/G22)
From £2,168.57GBP
Akrapovic BMW G20 G21 M340i & G26 M440i Titanium Exhaust Akrapovic BMW G20 G21 M340i & G26 M440i Titanium Exhaust
AkrapovicAkrapovic BMW G20/G21 M340i & G26 M440i Gran Coupe (Non-OPF/GPF) Evolution Line Titanium Exhaust System
£7,235.68GBP
Akrapovic BMW G20 G21 M340i & G26 M440i OPF Back Exhaust
AkrapovicAkrapovic BMW G20/G21 M340i & G26 M440i Gran Coupe OPF/GPF Slip On Line Titanium Exhaust System
£5,870.27GBP
Akrapovic BMW M340i & M440i Exhaust Sound Kit Akrapovic BMW M340i & M440i Exhaust Sound Kit
AkrapovicAkrapovic BMW M340i & M440i Exhaust Sound Kit (G20, G21, G22, G23 & G26)
£474.60GBP
BMW B58 Gen 2 OPF Sports Cat Downpipe CERAMIC COATED (G Series M240i, M340i, M440i, Z4 M40i, Supra A90 & more)
SLN PerformanceBMW B58 Gen 2 OPF Sports Cat Downpipe CERAMIC COATED (G Series M240i, M340i, M440i, Z4 M40i, Supra A90 & more)
£495.00GBP
BMW Helical Exhaust Valve 2.9inch SBS Type EV70532-MX0-33 BMW Helical Exhaust Valve 2.9inch SBS Type EV70532-MX0-33
Helical TechnologyHelical Technology BMW Helical Exhaust Valve 2.9inch SBS Type (Single)
£249.99GBP
Valvetronic Designs BMW G20 M340i & G22 M440i Valved Sport Exhaust System Valvetronic Designs BMW G20 M340i & G22 M440i Valved Sport Exhaust System
Valvetronic DesignsValvetronic Designs BMW G20 M340i & G22 M440i Valved Sport Exhaust System
From £2,840.00GBP
BMW B58 Gen 2 OPF Decat Downpipe CERAMIC COATED (G Series M240i, M340i, M440i, Z4 M40i, Supra A90 & more)
SLN PerformanceBMW B58 Gen 2 OPF Decat Downpipe CERAMIC COATED (G Series M240i, M340i, M440i, Z4 M40i, Supra A90 & more)
£320.00GBP
Milltek Sport Exhaust Valve Controller For BMW B58 Gen2 (G42 M240i, G20 M340i & Toyota GR Supra)
Milltek SportMilltek Sport Exhaust Valve Controller For BMW B58 Gen2 (G42 M240i, G20 M340i & Toyota GR Supra)
£421.82GBP
Genuine BMW B58 & B48 V-Band Turbo Downpipe Clamp 18305A09B63 Genuine BMW B58 & B48 V-Band Turbo Downpipe Clamp 18305A09B63
Genuine BMWGenuine BMW B58 & B48 V-Band Turbo Downpipe Clamp 18305A09B63
£27.83GBP
Leib BMW G Series B58 B48 CatOPF Delete With CAN BUS Pro Functions - R44 Performance
LEIB EngineeringLeib BMW M240i/M340i/M440i B58/B48 Cat/OPF Delete Kit With CAN BUS Pro Functions (G42/G20/G22/F40/F44)
£669.99GBP
Leib BMW G Series CAN BUS Pro 1 Valve (G42/G20/G22 etc)-R44 Performance Leib BMW G Series CAN BUS Pro 1 Valve (G42/G20/G22 etc)-R44 Performance
LEIB EngineeringLeib BMW G Series CAN BUS Pro 1 Valve (G42/G20/G22 etc)
£519.99GBP
Genuine BMW Exhaust Clamping Bush (70mm) 18307560780
Genuine BMWGenuine BMW Exhaust Clamping Bush Pipe Sleeve (70mm) 18307560780
£39.36GBP
dAHLer BMW Exhaust Flap/Valve Controller-R44 Performance dAHLer BMW Exhaust Flap/Valve Controller-R44 Performance
daHlerdAHLer BMW Exhaust Flap/Valve Controller
£571.99GBP

M340i (G20/G21) Exhaust Systems at a glance

Vehicle
2019–2027 BMW M340i (G20/G21)
Powertrain
3.0-litre B58TU turbocharged straight-six, 48V mild hybrid from 2020
Main parts
cat-back & valved exhaust systems, downpipes, exhaust valve controllers and mid-pipes
Brands
Akrapovic, LEIB Engineering, Scorpion Exhausts, Genuine BMW, SLN Performance, Helical Technology
Fitting & delivery
Fitting at R44 HQ, Wembley · UK & worldwide delivery
Parts listed
20 parts for the M340i (G20/G21)

BMW M340i (G20/G21) exhaust systems, downpipes & mid-pipes

R44 Performance stocks 20 exhaust parts for the 2019–2027 BMW M340i (G20/G21). Parts include cat-back & valved exhaust systems, downpipes, exhaust valve controllers and mid-pipes, from brands including Akrapovic, LEIB Engineering, Scorpion Exhausts, Genuine BMW, SLN Performance, Helical Technology.

Where you upgrade the exhaust decides what changes. A cat-back or valved rear section mainly changes the sound and look while keeping the car civilised. Mid-pipes replace the centre section and are a popular way to add volume and character. Downpipes replace the section after the turbo and, paired with an ECU tune, have the biggest effect on performance.

Some exhaust parts are sold for off-road and motorsport use only. Check the legality notes on each product, see our off-road and EPA disclaimer, or chat to our team for advice. We fit exhausts at R44 HQ in Wembley and deliver across the UK and worldwide.

Written by the R44 Performance team, Wembley, London

M340i (G20/G21) Exhaust Systems FAQs

What exhaust parts are available for the M340i (G20/G21)?

R44 Performance lists 20 exhaust parts for the BMW M340i (G20/G21), including cat-back & valved exhaust systems, downpipes, exhaust valve controllers and mid-pipes. Brands include Akrapovic, LEIB Engineering, Scorpion Exhausts, Genuine BMW, SLN Performance, Helical Technology, and every part is listed for the M340i (G20/G21) – check each product page for body style and model-year fitment.

What's the difference between a cat-back exhaust, mid-pipe and downpipe?

A cat-back or rear (often valved) section mainly changes the sound and look. Mid-pipes replace the centre section and are a popular way to add volume. Downpipes replace the section directly after the turbo(s) and are usually paired with an ECU tune.

Do I need a tune after fitting downpipes to my M340i (G20/G21)?

In most cases, yes. Downpipes change the exhaust flow the engine sees, so they're normally fitted together with a suitable ECU tune. Check the product description, or ask our team.

Are aftermarket exhausts road legal in the UK?

In the UK, parts that remove a catalytic converter or petrol particulate filter (OPF/GPF), or that break noise limits, are not road legal and are sold for off-road and motorsport use only – this includes many de-cat downpipes and mid-pipes that delete a secondary catalyst. You're responsible for making sure parts are legal for how you use your car. See our off-road and EPA disclaimer, or ask our team before you buy.

Will a louder exhaust drone on the motorway?

Valved systems let you close the valves for quiet cruising, and many systems are designed to reduce drone at motorway speeds. Product pages describe each system's character – our team can help you choose one that suits how you use your M340i (G20/G21).