BMW 640i OPF Decat Downpipe 740i 840i | MTC Motorsport
BMW 640i OPF Decat Downpipe 740i 840i | MTC Motorsport
BMW 640i OPF Decat Downpipe 740i 840i | MTC Motorsport
BMW 640i OPF Decat Downpipe 740i 840i | MTC Motorsport
BMW 640i OPF Decat Downpipe 740i 840i | MTC Motorsport

BMW 640i OPF Decat Downpipe 740i 840i | MTC Motorsport

Regular price £399.00
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Tax included. Shipping calculated at checkout.

5 in stock

MTC Motorsport BMW 640i 740i and 840i 4.5” stainless steel decat downpipe for B58 OPF engines only.

  • The BMW 640i downpipe is machined from SS304 aircraft-grade stainless steel and are tig welded in house
  • The B58 downpipe is made of 3.5" 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 OPF/PPF only:

  • BMW G20/21 M340i 3.0L 285KW/374PS 2020 OPF Model
  • BMW G30/31 540i 540ix 3.0L 250KW/340PS 2018 OPF Model
  • BMW G32 640i 640ix 3.0L 250KW/340PS 2018 OPF Model
  • BMW G11/12 740i 745le 745lex 745e 2019 OPF Model
  • BMW G14/15/16 840i 840ix 3.0L 250KW/340PS 2019 OPF Model
  • BMW Z4 G29 M40i 3.0L 250KW/340PS 2019 OPF Model
  • Toyota Supra MK5 A90 GR 3.0L 250KW/340PS 2019 OPF Model

Original BMW part number 18329897313.

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. 

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.