VRSF B58 4.5-inch Downpipe (Decat/Catless or 200 Cell Catted) - Brushed 304 Stainless - BMW M140i M240i 340i 440i 540i 740i xDrive (F20 F21 F22 F23 F30 F31 F32 F33 F36 G30 G11 G12) 2016+

VRSF 4.5 inch B58 Turbo Down Pipe - Decat or 200 Cell Sports Cat - Brushed SS304

Unlock serious performance and sound from your BMW B58 with the VRSF 4.5 inch turbo outlet pipe, available as a straight-through decat or a 200 cell high-flow sports catalyst. This is one of the most effective hardware upgrades for the M140i, M240i, 340i, 440i, 540i and 740i, including xDrive. Expect noticeably quicker spool, reduced exhaust restriction, stronger mid-range and a richer exhaust tone when paired with the right ECU calibration. Designed to integrate with the factory system or aftermarket cat-backs on both right-hand drive and left-hand drive models.

Precision fabricated from hand-crafted, TIG-welded SS304 with a smooth-brushed finish, the VRSF B58 down pipe uses a full 4.5 inch primary section and a CNC machined stainless flange for a clean, leak-free seal at the turbo. Choose the decat race pipe for maximum flow, or go for the motorsport-grade 200 CPSI catted version for a high-flow solution. VRSF cover the straight-through version with a lifetime warranty, while the catted unit carries a 12 month warranty.

Why enthusiasts choose this upgrade

• Faster turbo response and sharper throttle feel thanks to reduced back pressure
• Meaningful power gains with appropriate tuning on Stage 1 or Stage 2 B58 setups
• Deeper, more engaging soundtrack without compromising day-to-day use
• Plug-and-play fit on RHD and LHD cars with no cutting or welding required
• Compatible with the stock rear section and popular performance exhaust systems
• Premium materials throughout - TIG-welded SS304, brushed finish, CNC flange
• Choice of decat or 200 cell sport cat to suit road, track or fast-road builds

Technical highlights

• Material: SS304 stainless steel
• Construction: Hand fabricated with TIG welds and smooth radius bends
• Primary size: 4.5 inch diameter
• Options: Cat-delete race pipe or 200 CPSI high-flow sports catalyst
• Warranty: Lifetime on the decat version, 1 year on the catted version
• Fitment assurance: VRSF no-hassle guarantee on fit

Vehicle fitment

• BMW M140i M140i xDrive - F20 F21 - 2016+
• BMW M240i M240i xDrive - F22 F23 - 2016+
• BMW 340i 340i xDrive - F30 F31 - 2016+
• BMW 440i 440i xDrive - F32 F33 F36 - 2016+
• BMW 540i 540i xDrive - G30 - 2016+
• BMW 740i 740i xDrive - G11 G12 - 2016+

Real-world feedback

We run this hardware on our own B58 builds and customers consistently praise the fit, finish and sound improvement. It is a high-value upgrade that transforms response and character, especially when paired with a suitable map.

Professional installation

Want it fitted properly first time in the UK. Book with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a tailored installation quote.

Shipping and availability

Fast UK dispatch from MJ Modifications. These units are very popular so brief lead times can occur during peak demand. If timing matters, contact us and we will confirm current stock status.

Important notes

• Decat version is intended for off-road and track use where permitted
• Catted variant uses a motorsport-grade 200 cell catalyst for high flow

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