MTC Motorsport Stainless Steel Decat Downpipe Exhaust Pipe For BMW M140i

  • £299.99
    Unit price per 
Tax included.


MTC Motorsport BMW M140i M240i 340i 440i 540i and 740i 4.5” stainless steel decat downpipe for B58 engine only.

This will NOT fit the 2018 onwards models with the PPF filter unless it has been coded out and can be removed. The downpipe and flange are machined from SS304 aircraft-grade stainless steel and are tig welded in house to deliver the best quality.


This downpipe will fit the following models with a B58 engine:


BMW M140i 2016+ F20 and F21 and xDrive.

BMW M240i 2016+ F22 and xDrive.

BMW 340i 2016+ F30 F31 and xDrive.

BMW 440i 2016+ F32 F33 F36 and xDrive.

BMW 540i 2016+ G30 and xDrive.

BMW 740i 2016+ G11 G12 and xDrive.


The B58 downpipe is made of 4.5" stainless pipe straight out of the turbo providing a sharper throttle response due to faster spool of the turbo. This downpipe will provide noticeable power gains and a much more aggressive exhaust note which sounds truly amazing. It produces lower temperatures and less exhaust backpressure due to the relief of the turbocharger. The cylinder charge is increased which contributes to maximum performance.

There is also a substantial weight saving in comparison to the factory catalytic converter. The decat is mandrel-bent for better gas flow and maximum internal size to ensure ultimate performance without the loss of mid-range torque. 

We have tested this product and found increases of around 20-25bhp.

Professional installation is recommended as some exhausts sit slightly different from others and can be tight although the feedback we have received from this product is that it is very easy to fit.