SLN BMW B58 Super 5” Decat Downpipe CERAMIC COATED

The SLN Performance 5” Ceramic Coated Decat Downpipe is a maximum-flow upgrade for the Gen 1 BMW B58 engine. Featuring a huge 5” primary section stepping down to a 4” flex pipe, this is the largest and highest-flowing downpipe design available for the platform. Combined with a ceramic thermal coating, it delivers big gains in power, faster spool, sharper throttle response and a significantly louder, more aggressive exhaust note.

Fitment: B58 Gen 1 Models – M140i, M240i, 340i, 440i

Key Features

Oversized 5” to 4” Decat Design

– The highest-flowing downpipe available for Gen 1 B58
– Maximum exhaust flow for big performance gains
– No catalyst for unrestricted turbo response

Ceramic Thermal Coating

– Reduces engine bay heat
– Helps maintain lower intake temperatures
– Protects surrounding components during hard use

SS304 Aircraft-Grade Construction

– Premium stainless steel
– TIG-welded for strength and durability
– Designed for tuned and high-boost applications

Benefits

The SLN 5” decat downpipe unleashes the full potential of the B58 engine. Expect major improvements in spool time, mid-range punch and overall power while transforming the car’s exhaust note into something far more aggressive and motorsport-driven. Ideal for high-power builds and drivers who want the maximum possible performance.

Fitment

Suitable for B58 Gen 1 BMWs:

– BMW F20/F21 M140i (2016+)
– BMW F22/F23 M240i (2016+)
– BMW F30 340i (2016+)
– BMW F32 440i (2016+)

Installation Notes

– Not MOT legal (decat)
– ECU tune recommended
– Professional installation advised

About SLN Performance

SLN Performance manufactures premium exhaust components built to deliver maximum flow, durability and performance. Their ceramic-coated B58 downpipes are highly regarded for reliability under extreme heat and boost pressures.