Downpipe For BMW B58 M240i/340i/440i/540i/740i XDrive F21 F22 F30 F31 F34 G20/31
Downpipe For BMW B58 M240i/340i/440i/540i/740i XDrive F21 F22 F30 F31 F34 G20/31 is a 100% stainless steel performance exhaust component priced at $160.00. It delivers increased horsepower and torque by removing the catalytic converter, ideal for off-road BMW tuning enthusiasts seeking bolt-on power gains.
● In stock
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Key features
- 100% stainless steel construction
- Tapered V-band for increased velocity
- TIG welded for durability
- Bolt-on fit for B58 engines
- Retains factory O2 sensors
- Straight-through design reduces backpressure
- Supports +15HP and +25 torque
Pros
- +Affordable performance upgrade at $160
- +Simple bolt-on installation
- +Noticeable power and throttle response gains
- +Durable stainless steel build
- +Works with future exhaust modifications
Cons
- −Triggers check engine light without tune
- −Not legal for street use in California
- −Requires ECU remap for optimal performance
About Downpipe For BMW B58 M240i/340i/440i/540i/740i XDrive F21 F22 F30 F31 F34 G20/31
What is Downpipe For BMW B58 M240i/340i/440i/540i/740i XDrive F21 F22 F30 F31 F34 G20/31?
The Downpipe For BMW B58 M240i/340i/440i/540i/740i XDrive F21 F22 F30 F31 F34 G20/31 is a high-performance exhaust upgrade engineered for BMWs equipped with the B58 3.0L turbocharged engine. Crafted from 100% stainless steel, this direct-fit downpipe replaces the factory unit to eliminate the catalytic converter, enabling maximum exhaust flow and improved engine efficiency. Designed for easy installation, it connects directly to the turbocharger and maintains compatibility with factory oxygen sensors and mounting brackets. While intended for off-road use, it's a popular choice among tuners looking to extract more power from their BMW platform.
Key features
- 100% Stainless Steel — Resists corrosion and ensures long-term durability under high heat.
- Tapered V-Band Design — Increases exhaust velocity for improved turbo spool and performance.
- TIG Welded Construction — Provides superior strength and leak-free joints.
- Bolt-On Installation — No modifications required; fits factory mounting points.
- O2 Sensor Compatible — Retains factory oxygen sensor locations for simplified setup.
- Performance Gains — Delivers approximately 15 horsepower and 25 lb-ft of torque.
- Straight-Through Flow — Minimizes backpressure for enhanced engine breathing.
Who is Downpipe For BMW B58 M240i/340i/440i/540i/740i XDrive F21 F22 F30 F31 F34 G20/31 for?
This downpipe is designed for BMW owners with B58-powered models including the M240i, 340i, 440i, 540i, and 740i from 2016 onward. It suits DIY mechanics and performance enthusiasts who want to upgrade their exhaust system for better sound and power. Ideal for track-day drivers or tuners planning ECU remapping, it supports future modifications like intakes and exhausts. Not recommended for daily-driven vehicles in CARB-regulated states due to emissions compliance.
How does Downpipe For BMW B58 M240i/340i/440i/540i/740i XDrive F21 F22 F30 F31 F34 G20/31 compare?
Compared to stock downpipes, this unit removes restrictive catalytic converters, significantly improving exhaust flow and engine response. Unlike high-priced branded alternatives, it offers a cost-effective path to performance gains without sacrificing build quality. When stacked against standard polypropylene or mild steel exhaust parts, its stainless steel construction ensures better heat resistance and longevity. It outperforms resonated or catted downpipes in power delivery but requires ECU tuning to prevent check engine lights, making it best suited for modified setups rather than stock-driven applications.
Best use cases
- →Track-day prepared BMW builds
- →Off-road performance tuning
- →ECU-remapped B58 engine upgrades
- →DIY exhaust system modifications
- →Sound and flow improvement projects
Is Downpipe For BMW B58 M240i/340i/440i/540i/740i XDrive F21 F22 F30 F31 F34 G20/31 right for you?
This downpipe suits B58-powered BMW owners seeking affordable power gains. Ideal for intermediate DIYers comfortable with undercar work and ECU tuning. Not for stock daily drivers in emissions-regulated areas. Consider a catted downpipe or factory unit if avoiding check engine lights or staying street-legal in CARB states is a priority. Pairs well with intake and exhaust upgrades for full system gains.
How it compares: Outperforms stock and catted downpipes in flow and power, but lacks emissions compliance. More affordable than premium brands while using similar stainless steel and V-band design. Requires tuning unlike factory-style replacements.
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What vehicles is this downpipe compatible with?
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This downpipe fits BMW models with the B58 3.0L turbo engine including M240i, 340i, 440i, 540i, and 740i from 2016–present, covering F20, F30, F32, G20, G30, and related chassis.
Does this downpipe require a tune?
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Yes, a check engine light will appear without ECU remapping. A tune is strongly recommended to disable the pre-cat O2 sensor and optimize performance after installation.
How much horsepower does it add?
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Expect gains of approximately 15 horsepower and 25 lb-ft of torque when combined with a proper ECU tune, improving throttle response and turbo efficiency.
Is this downpipe legal for street use?
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No, this downpipe is for off-road use only and does not meet CARB regulations. It is not legal for street use in California or other emissions-sensitive states.
Can I install this myself?
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Yes, it's a bolt-on part designed for direct replacement of the factory downpipe. Basic mechanical skills and common tools are required for installation.
How much does Downpipe For BMW B58 M240i/340i/440i/540i/740i XDrive F21 F22 F30 F31 F34 G20/31 cost?
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Downpipe For BMW B58 M240i/340i/440i/540i/740i XDrive F21 F22 F30 F31 F34 G20/31 is $160.00 at Lab Work Auto. Prices may change — click through to Lab Work Auto for the latest.
Is Downpipe For BMW B58 M240i/340i/440i/540i/740i XDrive F21 F22 F30 F31 F34 G20/31 in stock at Lab Work Auto?
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Yes, Downpipe For BMW B58 M240i/340i/440i/540i/740i XDrive F21 F22 F30 F31 F34 G20/31 is currently in stock at Lab Work Auto.
Specifications
- SKU
- F8-020671