SLN BMW B58 OPF Ceramic Coated Decat Downpipe M240i M340i M440i 540i 640i 840i

The SLN Performance Ceramic Coated Decat Downpipe is a high-flow upgrade designed specifically for Gen 2 B58 OPF-equipped models. Constructed from SS304 aircraft-grade stainless steel and finished in a heat-reducing ceramic coating, it delivers faster turbo spool, increased power, stronger mid-range torque and a far more aggressive exhaust tone. A perfect choice for drivers who want maximum sound and performance from their B58.

Fitment: B58 Gen 2 OPF Models – M240i, M340i, M440i, 540i, 640i, 740i, 840i, Z4 M40i, Supra A90/A91

Key Features

High-Flow Decat Design

– Maximum exhaust flow for optimal power
– Faster turbo spool and stronger throttle response
– Aggressive exhaust tone with enhanced turbo sounds

Ceramic Thermal Coating

– Reduces engine bay temperatures
– Supports lower intake air temperatures
– Protects surrounding components from radiant heat

Premium SS304 Construction

– Built from aircraft-grade stainless steel
– TIG-welded for durability
– Designed to handle high heat and high boost

Benefits

This SLN Performance decat downpipe transforms the feel of the B58 OPF engine. Expect sharper response, noticeable gains in mid-range torque and a deeper, louder, more exciting exhaust character. The ceramic coating also helps control heat in the engine bay for more stable performance.

Fitment

Suitable for the following OPF/PPF B58 Gen 2 models:

– BMW G42 M240i xDrive (2021+)
– BMW G20/G21 M340i (2019+)
– BMW G22 M440i (2019+)
– BMW G30/G31 540i (2018+)
– BMW G32 640i (2018+)
– BMW G11/G12 740i (2019+)
– BMW G14/G15/G16 840i (2019+)
– BMW Z4 G29 M40i (2019+)
– Toyota Supra A90 / A91 GR (2019+)

Installation Notes

– For OPF/PPF vehicles only
– ECU tune recommended
– Professional installation advised
– Not road legal; for off-road/motorsport use only

About SLN Performance

SLN Performance produces high-quality stainless steel exhaust and induction components engineered for strength, reliability and maximum flow. Trusted throughout the tuning world, SLN products are built to withstand high temperatures, high boost and demanding performance driving.