BMW M340i downpipes

15 downpipes for the G20 BMW M340i (B58 3.0L turbo inline-six) from 10 brands. The downpipe joins the turbocharger outlet to the rest of the exhaust. Aftermarket versions are sold with a high-flow catalytic converter or without one.

Before you order

Removing or replacing a catalytic converter with a part that is not certified for the vehicle is illegal for road use under the federal Clean Air Act. Catless parts are sold for off-road use only.
In California and other CARB states a replacement converter needs an Executive Order number for the specific vehicle.
Check the retailer listing for whether engine software changes are required.
Listings are read from the retailer's G20 M340i (B58 3.0L) category. Many parts fit both rear-wheel-drive and xDrive cars, but not all. Confirm drivetrain, model year and options on the retailer page before ordering.

Brands on this page: Active Autowerke (4), VRSF (3), 034Motorsport (1), CG Precision (1), CTS (1), Evolution Racewerks (1), MAD (1), Racing Dynamics (1), Supersprint (1), Valvetronic Designs (1).

Downpipe (14)

034Motorsport · Part no. 034-105-4051
Stainless Steel Catted Downpipe
Unlock the true potential of your B58-equipped BMW!
Retailer fitment note: For 2018-2019 models only
Check price at ECS Tuning for 034Motorsport Stainless Steel Catted Downpipe (opens the retailer site)
Active Autowerke · Part no. 11-062A
Active Autowerke Aflow Catted Race Downpipe - B58
No CEL Produced from this Downpipe!
Retailer fitment note: For 2024 and earlier models only
Check price at ECS Tuning for Active Autowerke Active Autowerke Aflow Catted Race Downpipe - B58 (opens the retailer site)
Active Autowerke · Part no. 11-062
Active Autowerke GESI Catted Race Downpipe - B58
No CEL Produced from this Downpipe!
Retailer fitment note: For 2024 and earlier models only
Check price at ECS Tuning for Active Autowerke Active Autowerke GESI Catted Race Downpipe - B58 (opens the retailer site)
Active Autowerke · Part no. 11-062G
GESI Catted Downpipe - B58N M340i/440i
EPA compliant cat with increased flow and performance!
Retailer fitment note: For Model Years 2025+ - Please call in with vin prior to purchase For Model Years 2025+
Check price at ECS Tuning for Active Autowerke GESI Catted Downpipe - B58N M340i/440i (opens the retailer site)
CG Precision · Part no. 0005DS1
DS-1 – Hi-Flow Race Catted Downpipe
Bolt on power!
Check price at ECS Tuning for CG Precision DS-1 – Hi-Flow Race Catted Downpipe (opens the retailer site)
CTS · Part no. CTSEXHDP0024CAT
CTS Turbo Catted Downpipe
Maximizes exhaust flow for uncompromising performance.
Check price at ECS Tuning for CTS CTS Turbo Catted Downpipe (opens the retailer site)
Evolution Racewerks · Part no. BMEXH018C
B58 High Flow Catted Downpipe
Make more power while still passing emissions!
Check price at ECS Tuning for Evolution Racewerks B58 High Flow Catted Downpipe (opens the retailer site)
MAD · Part no. MAD-3056
MAD Performance 4.5" Catted Downpipe - B58
Less restriction, faster turbo spool, improved sound!
Check price at ECS Tuning for MAD MAD Performance 4.5" Catted Downpipe - B58 (opens the retailer site)
Racing Dynamics · Part no. 1301058360
Racing Dynamics Catted Downpipe
Free up your exhaust system and add more power!
Check price at ECS Tuning for Racing Dynamics Racing Dynamics Catted Downpipe (opens the retailer site)
Supersprint · Part no. 524241
Downpipe with Sport Catalytic Converter
Down pipe with 200 cell catalytic converter
Check price at ECS Tuning for Supersprint Downpipe with Sport Catalytic Converter (opens the retailer site)
VRSF · Part no. 10202011
VRSF Catted Downpipe Upgrade - Brushed Finish
Reduce Back-Pressure & Increase Power
Check price at ECS Tuning for VRSF VRSF Catted Downpipe Upgrade - Brushed Finish (opens the retailer site)
VRSF · Part no. 10202028
VRSF Catted Downpipe Upgrade - W/ Heat Shield
Reduce Back-Pressure & Increase Power
Check price at ECS Tuning for VRSF VRSF Catted Downpipe Upgrade - W/ Heat Shield (opens the retailer site)
VRSF · Part no. 504010
VRSF Replacement Chargepipe Methanol/Water Injection Bung Plug
This plug is a replacement for the following models: 10901020A, 10901020B, 10901020C, 10901020D, 10301050, 10101020 and any other VRSF chargepipe that utilizes a water injection bung
Retailer fitment note: Fits N54/ N55/ N20/ N26/ S55/ B58 Engines from 2007-2016
Check price at ECS Tuning for VRSF VRSF Replacement Chargepipe Methanol/Water Injection Bung Plug (opens the retailer site)
Valvetronic Designs · Part no. B58FF400CBR
B58N 400 Cell Catted Downpipe
Engineered for the Gen 2 B58 Turbocharged Inline-6 - High-Flow - EPA Compliant
Retailer fitment note: For 2025+ model years
Check price at ECS Tuning for Valvetronic Designs B58N 400 Cell Catted Downpipe (opens the retailer site)

Catalytic Converter (1)

Active Autowerke · Part no. 11-062GA
Active Autowerke AFlow Catted Downpipe - B58N G20/G22 M340/M440i
Get uncompromised performance out of your B58 while remaining emission compliant!
Retailer fitment note: For 2025+ model year vehicles -- Please call in with vin prior to purchase
Check price at ECS Tuning for Active Autowerke Active Autowerke AFlow Catted Downpipe - B58N G20/G22 M340/M440i (opens the retailer site)

Guides for this decision

Modification & Performance Guides · BMW

BMW M340i Exhaust: Axle-Back vs Cat-Back Comparison

Explore the differences between axle-back and cat-back BMW M340i exhaust systems, focusing on sound, drone, and daily usability for your vehicle.

By Lee Shahin · Sep 26, 2026

Explore: Modification & Performance Parts · Exhaust Systems

BMW M340i downpipes

Before you order

Downpipe (14)

Stainless Steel Catted Downpipe

Active Autowerke Aflow Catted Race Downpipe - B58

Active Autowerke GESI Catted Race Downpipe - B58

GESI Catted Downpipe - B58N M340i/440i

DS-1 – Hi-Flow Race Catted Downpipe

CTS Turbo Catted Downpipe

B58 High Flow Catted Downpipe

MAD Performance 4.5" Catted Downpipe - B58

Racing Dynamics Catted Downpipe

Downpipe with Sport Catalytic Converter

VRSF Catted Downpipe Upgrade - Brushed Finish

VRSF Catted Downpipe Upgrade - W/ Heat Shield

VRSF Replacement Chargepipe Methanol/Water Injection Bung Plug

B58N 400 Cell Catted Downpipe

Catalytic Converter (1)

Active Autowerke AFlow Catted Downpipe - B58N G20/G22 M340/M440i

Guides for this decision

BMW M340i Exhaust: Axle-Back vs Cat-Back Comparison

More BMW M340i parts