Wagner Tuning B58 Catted Downpipe Kit for M140i M240i 340i 440i
Product Description
The Wagner Tuning B58 Catted Downpipe is a high-flow, motorsport-grade upgrade designed to replace the restrictive OEM catalytic converter on BMW F-Series B58 models. Built to improve exhaust flow, turbo response and overall performance, this downpipe features a high-quality sport catalyst engineered for fast-road use, tuned applications and track environments where a catted system is preferred.
With precision stainless-steel construction and OEM-style fitment, Wagner’s catted downpipe provides a proven, reliable solution for B58 drivers looking to unlock power gains without excessive noise or compromise in drivability.
Key Features
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High-flow sports catalyst for increased exhaust velocity
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TIG-welded stainless-steel construction for durability
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Reduces turbo lag and improves throttle response
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Designed to support Stage 1 and Stage 2 power levels
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OEM-style mounting points for direct bolt-on installation
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Improved mid-range torque and enhanced overall performance
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Designed for B58 Gen 1 F-Series models
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Suitable for fast-road and track use
Compatibility
BMW F-Series B58 Models
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M140i (F20/F21)
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M240i (F22/F23)
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340i (F30/F31/F34)
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440i (F32/F33/F36)
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X3 M40i / X4 M40i (selected F-series variants with B58 Gen 1)
(Fits most Gen 1 B58 F-Series models. Not suitable for G-Series or OPF-equipped cars.)
Ideal For
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Tuned B58 engines running Stage 1 or Stage 2 software
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Fast-road and track users wanting better turbo efficiency
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Cars fitted with upgraded intercoolers, intakes or turbo systems
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Drivers who want the performance benefits of a downpipe without going fully decat
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Owners looking to reduce heat and backpressure while maintaining refined sound levels
Why Choose the Wagner Tuning B58 Catted Downpipe Kit
Wagner Tuning is renowned for delivering high-quality, high-flow exhaust components suitable for both road and motorsport use. Their B58 catted downpipe significantly improves exhaust gas flow compared to the OEM unit, unlocking power and reducing turbo strain — especially beneficial for tuned vehicles.
The use of a high-flow sport catalyst retains a cleaner emission profile and a more controlled exhaust tone while offering the durability and precision fitment that Wagner products are known for. For B58 owners wanting reliable, consistent and measurable performance gains, this downpipe is one of the most trusted options on the market.
Installing / Notes
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Professional installation recommended due to fitment tolerances and sensor handling
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Software calibration advised to optimise performance and avoid CEL warnings
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Designed for off-road, track or motorsport use where regulations permit
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Not suitable for OPF/GPF-equipped vehicles
Shipping & Delivery
Dispatch Times
Most stocked items dispatch within 1–2 business days. Some products may have longer lead times due to special ordering, availability, or build times. If your order contains multiple items, they may be shipped together once all items are ready unless otherwise agreed.
UK & International Shipping
We ship worldwide. Transit times vary depending on destination and courier. Tracking details are provided once your order is dispatched.
Import Duties & International Orders
International customers are responsible for all import duties, taxes, and clearance fees. These are not included in our prices and are outside of our control. Refusal or non-payment of import charges may result in return shipping, handling fees, and customs charges being deducted from any refund.
Damaged Shipments
If your parcel arrives visibly damaged, please refuse delivery or note the damage with the courier. If damage is discovered after opening, contact us immediately with photos. Do not install damaged items, as installation voids courier claims and return eligibility.
Returns
Returns must be authorised before sending anything back. Returns must be requested within 14 days of delivery and returned within 14 days of approval, in unused/uninstalled condition and in original packaging. Some items, including special-order, built-to-order, used, installed, or modified parts, are non-returnable.
Full details are available in our Shipping Policy and Returns & Refund Policy.
Warranty & Disclaimer
Warranty
Most products include a manufacturer’s warranty covering manufacturing defects only. Warranties do not cover wear and tear, improper installation, misuse or neglect, track use, competition or racing environments, labour costs, vehicle damage, downtime, or consequential loss. Warranty outcomes are determined by the manufacturer, not Clubsport Garage. Items must be returned for inspection at the customer’s cost unless agreed otherwise.
Fitment & Installation
Many products are aftermarket components and may require professional installation or minor adjustment. Perfect OEM-level fitment cannot be guaranteed. Professional installation by an experienced workshop is strongly recommended. Installed or used items cannot be returned.
Motorsport Use Disclaimer
Some products are intended for off-road, track, or motorsport use only and may not be legal for road use, for example non-TÜV/DOT-approved parts. It is the customer’s responsibility to ensure compliance with local laws, insurance requirements, and vehicle regulations. By purchasing and installing aftermarket parts, you accept all responsibility for ensuring compatibility, legal compliance, proper installation, and any resulting wear, damage, or failure.
Product Images & Descriptions
Product photos are illustrative and may differ slightly from the item supplied. If specific details are important, please contact us before purchasing.
Full details are available in our Terms of Service and related policy pages.
