BMW B58 3.0T M240i M340i M440i 540i 740i 4.5 inch Stainless Steel Catless Downpipe with Gaskets and Hardware

Product Overview

This 4.5 inch catless downpipe is designed for BMW models powered by the B58 3.0T turbocharged inline-six. The supplier lists a broad range of applications including the M240i, M340i, M440i, 540i, 640i, 740i and 840i. Made from stainless steel, it is supplied with gaskets and mounting hardware, and is intended for motorsport and tuned builds.

Key Features and Benefits

• Large 4.5 inch pipe diameter
• Catless design for maximum flow
• Stainless steel construction
• Gaskets and mounting hardware included
• Designed for the B58 3.0T turbo L6

Vehicle Compatibility

The supplier lists M240i, M340i, M440i, 540i, 640i, 740i and 840i models with the B58 3.0T, and chassis codes F22, F23, F30, F31, F32, F33, F36, G30 and G32. The model and chassis lists do not fully align, and both B58 generations may be involved, so fitment is supplier-stated, not independently verified, and should be confirmed with us before ordering.

Product Specifications

• Product type: catless downpipe
• Pipe diameter: 4.5 inch
• Material: stainless steel
• Thickness: standard (exact figure not stated)
• Engine: B58 3.0T turbo L6
• Chassis listed: F22, F23, F30, F31, F32, F33, F36, G30, G32
• Package size: 66 x 27 x 19 cm
• Gross weight: approx. 3.9 kg

Installation and Usage

This downpipe should be fitted by a performance workshop experienced with B58 engines. With gaskets and hardware supplied, the installer can bolt it directly to the turbo outlet and exhaust, though some vehicles may require additional disassembly for access. ECU calibration is required when removing the catalytic converter. Check sensors, flanges and clearances after fitting.

Package Contents

The supplier states the package includes the catless downpipe, gaskets and mounting hardware, sold as a single item.

Important Fitment Notice

Please send us your VIN or chassis number before ordering so we can help confirm fitment and engine generation. Catless downpipes are intended for off-road and motorsport use only. Removing a catalytic converter from a road vehicle in New Zealand may breach emissions requirements and cause a WoF failure; the owner is responsible for compliance.