BMW M140i B58 Decat Downpipe M240i 340i 440i | MTC Motorsport
BMW M140i B58 Decat Downpipe M240i 340i 440i | MTC Motorsport
BMW M140i B58 Decat Downpipe M240i 340i 440i | MTC Motorsport
BMW M140i B58 Decat Downpipe M240i 340i 440i | MTC Motorsport
BMW M140i B58 Decat Downpipe M240i 340i 440i | MTC Motorsport
BMW M140i B58 Decat Downpipe M240i 340i 440i | MTC Motorsport

BMW M140i B58 Decat Downpipe M240i 340i 440i | MTC Motorsport

Regular price £299.00
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10 in stock

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

  • The M140i downpipe is machined from SS304 aircraft-grade stainless steel and are tig welded in house
  • 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. Also, the cylinder charge is increased
  • 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.  

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

This will NOT fit the 2018 onwards models with the PPF filter unless it has been coded out and can be removed.

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.


Please note, you will need to swap the gasket in the turbo end of the downpipe over or you will get a smell of fuel in the cabin.


We also recommend purchasing a Lambda Sensor Spacer(s) to prevent the engine light coming on in most cases. If you search our other items you will find these. 


This product comes with a lifetime warranty.

Why choose us?

Engineered for Performance

All of our uprated intercoolers, downpipes, hoses and other performance parts have been designed and engineered in-house here in the UK.

Consistant Quality

Here at MTC Motorsport, we are dedicated to providing quality made products at a competitive price. Each product we create is tested on a vehicle before going on sale to the public so you can be sure you are getting a 100% tested and working product.