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TCM B58 4.5" Race Downpipe BMW 240i/340i/440i/Supra/X3 F/G Chassis

TCM B58 4.5" Race Downpipe BMW 240i/340i/440i/Supra/X3 F/G Chassis

Low stock: 2 left

Regular price $239.99 USD
Regular price $259.00 USD Sale price $239.99 USD
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TCM is proud to release the B58 Catless Downpipe for your BMW or Supra

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A TCM Catless B58 Downpipe is an essential upgrade for any enthusiast looking to maximize the performance of their B58 engine.

Our downpipe is made from high-quality 304 stainless steal. It is designed to provide maximum exhaust flow and improve turbo spool time, resulting in increased horsepower and torque. By removing the factory catalytic converter and keeping a large internal diameter with a smooth transition down to the midpipe size, we're able to maximize exhaust flow and reduce air turbulence. Giving you more power.

Not only does this provide an increase in power, it also provides you with a nice increase in exhaust tone. Making your car sound more aggressive.

The catless design eliminates the restrictive catalytic converter, allowing for maximum exhaust flow and reducing backpressure. This results in a noticeable increase in power and throttle response, as well as a more aggressive exhaust note.

The TCM Downpipe is a direct bolt-on replacement for the factory downpipe, no need to make any cuts or alterations.

The downpipe is also designed to work seamlessly with the factory exhaust system, as well as aftermarket systems.


  • Compatible with right-hand drive and left-hand drive vehicles
  • Smooth bends for maximum airflow without any drone
  • 304 stainless steel, which provides excellent durability and resistance to corrosion.
  • Up to 30HP increase on the stock turbos, even more on upgraded turbos
  • Lifetime warranty on defects and fitment
  • 90 day return period
  • All orders ship in 1-2 business days
  • Fitment Guaranteed 
  • Flex section



Fits RWD and AWD

  • 2016–2021 BMW 240/M240 F22/F23
  • 2022+ BMW M240i G42
  • 2016-2019 BMW 340i F30/F31/F34
  • 2016-2019 BMW 440i F32/F33/F36
  • 2020+ BMW M340i G20/G21
  • 2016+ BMW 440i G22/G23/G26
  • 2016-2024 BMW 540i G30/G31
  • 2017-2023 BMW 640i G32
  • 2016-2024 BMW 740i G11/G12
  • 2018+ BMW 840i G14/G15/G16
  • 2017+ BMW X3 M40 G01
  • 2017+ BMW X4 M40 G02
  • 2017+ BMW X5 M40 G05
  • 2017+ BMW X6 M40 G06
  • 2017+ BMW X7 M40 G07
  • 2019+ BMW Z3 40 G29
  • 2019+ Toyota Supra 3.0L A90/A91


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