Description
Downpipe, Catted w/ Heat Shield – BMW G20/G22 M340i & M440i (Gen3 B58, 2024+) – 5″ Diameter
Replace your restrictive factory downpipe and unlock improved exhaust flow, throttle response, and turbo efficiency with this high-flow catted downpipe with heat shield, specifically engineered for the BMW G20/G22 M340i and M440i powered by the Gen3 B58 3.0L engine (2024 and newer).
Constructed with precision and performance in mind, this 5-inch diameter downpipe optimizes exhaust evacuation from the turbocharger, reducing backpressure and unlocking potential power gains across the powerband while maintaining emissions compliance for street use.
Performance Features
High-Flow Catalytic Converter (Catted):
A performance-oriented high-flow catalytic converter is integrated into the downpipe to allow improved exhaust flow while retaining catalytic function. This design helps reduce emissions relative to a cat-less alternative, making it suitable for street vehicles where emissions equipment must remain.
5-Inch Diameter Tubing:
Larger than the factory downpipe diameter, the 5″ tubing dramatically increases exhaust flow capacity, reduces backpressure, and supports stronger turbo spool and power delivery—especially in high-output and tuned applications.
Integrated Heat Shield:
The precision-formed heat shield protects surrounding components from excessive radiant heat and improves thermal management for the turbo and downstream exhaust system, helping maintain consistent performance.
Precision Fitment:
Purpose-built for the Gen3 B58 platform, this downpipe bolts directly to the OEM turbo outlet and factory exhaust, ensuring proper alignment, minimal modification, and reliable operation.
Durable Construction:
Made from thick-wall, mandrel-bent stainless steel (typically T304 or equivalent), this downpipe resists corrosion and stress from thermal cycles. High-quality welding and smooth bends promote maximum flow and longevity.
Benefits
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Increased exhaust flow for improved performance
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Potential gains in mid-range and top-end power with tuning
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Enhanced turbo response and reduced backpressure
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Heat-managed design for improved under-hood temperatures
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Designed for direct fit and straightforward installation
Fitment
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BMW G20 M340i (Gen3 B58) — 2024 and newer
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BMW G22 M440i (Gen3 B58) — 2024 and newer
Emissions & Use
This catted downpipe retains a catalytic converter for emissions compatibility. Confirm local regulations before installation, as emissions laws vary by region.
