Which BMW OE part numbers does this replace?

MagnaFlow 5411031 interchanges with BMW part numbers 18 30 7 840 684 and 18 30 7 848 117. If your dealer or shop quotes either of these, this converter is the direct replacement.

Will this converter restrict the S65 V8 exhaust flow?

MagnaFlow uses mandrel-bent tubing that replicates the OE exhaust geometry. The internal diameter stays consistent through every bend, maintaining the factory-designed flow characteristics for the S65 engine.

Is welding required on the M3?

No. This is a bolt-on direct-fit converter with two Torca AccuSeal clamps included. That said, given the M3's exhaust routing, many owners choose professional installation for convenience.

Can I install this in California?

Yes. This converter meets California Air Resources Board requirements and is legal in all 50 states. Verify your M3's Executive Order number and Engine Family Number match the converter's CARB Executive Order.

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Specifications

Brand: Magnaflow
Part #: 5411031
UPC: 888563106731

MagnaFlow Conv DF 08-13 BMW M3 4.0L

Name: MagnaFlow Conv DF 08-13 BMW M3 4.0L
Brand: Magnaflow
Price: 4563.00 USD
Availability: InStock

$4563.00

On Backorder

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Fits 2008-2013 BMW M3 (E90/E92/E93) 4.0L S65 V8. MagnaFlow CARB-compliant direct-fit catalytic converter with bolt-on install and two included Torca clamps.

Key Features

Fits 2008-2013 BMW M3 with the 4.0L S65 V8 engine (E90, E92, E93)
CARB-compliant and legal in all 50 states including California, Colorado, New York, and Maine
Interchanges with BMW OE part numbers 18 30 7 840 684 and 18 30 7 848 117
Direct-fit bolt-on design using 3D-scanned OE geometry for precise M3 fitment
16-gauge 409 stainless steel tubing with 308 stainless steel MIG welds
Mandrel-bent tubing maintains consistent internal diameter for the high-revving S65 engine

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Fits this vehicle

BMW M3 2008-2013

Advanced difficulty to install

Bolt-on direct-fit design with no welding required, but the M3 exhaust layout is tighter than a typical truck application. Professional installation is recommended for most owners.

Product Details

BMW M3 owners know that the S65 4.0L V8 in the E90, E92, and E93 is a special engine, and replacing the catalytic converter at the dealership comes with a price tag to match. MagnaFlow 5411031 is a CARB-compliant direct-fit alternative that bolts into the 2008-2013 M3 exhaust system without compromising flow or compliance.

Built for the S65 V8

MagnaFlow used 3D scanning to replicate the factory exhaust geometry of the M3, ensuring this converter matches the OE routing. It interchanges directly with BMW part numbers 18 30 7 840 684 and 18 30 7 848 117, so if your shop quotes either of those numbers, this is the replacement. Mandrel-bent tubing maintains a consistent internal diameter to keep exhaust flowing smoothly on a high-revving engine where every bit of restriction matters.

Stainless Steel Construction

The body is 16-gauge 409 stainless steel tubing with 308 stainless steel MIG welds. The spun body design with a single laser fusion weld minimizes leak potential, and the precision stamped collector keeps exhaust flow efficient. Two Torca AccuSeal clamps are included for even, distortion-free connections at both ends.

Legal Everywhere

CARB-compliant and legal for sale and installation in all 50 states, including California, Colorado, New York, and Maine. Verify your M3's Executive Order and Engine Family Number match before installing.

For M3 owners who want to keep their S65 running clean without the dealership markup, this MagnaFlow converter matches the factory fit and carries full CARB certification.