The BMW B58 Downpipe Catless or High Flow Catted is the best mod you can do. Do you want to unlock high horsepower numbers with your BMW B58 Engine in your BMW M140i, M240i, M340i, M440i, 540i, 640i, 745e or Supra 3.0? Installing a B58 Downpipe  for your BMW B58 will provide great performance and is the best bang for buck modification. Purchase your B58 downpipe for more performance.

DCE Parts - B58 Downpipe - F & G Chassis - BMW M140i, M240i, M340i, M440i, 540i, 640i, 745E, 840i, Z4, Supra & XDRIVE - (OPF & V-Band Flange Type)

The downpipe is 5.2 inch (132mm) measured at the biggest point including heat shield. The downpipe is 5.1 inch (129mm) excluding the heat shield

Through the placement of a bigger B58 Downpipe the turbo spools up quicker due to a lower back pressure. The turbo starts to build up pressure at lower speeds. It also manages to build it pressure quicker after gear changes. The installation of the B58 Downpipe alone usually provides 15 HP and 25Nm extra. By installing the downpipe, you will enhance the sound of your vehicle as well.

For proper operation and optimal power output, the vehicle will need remapping of the ECU to accommodate the catless downpipe. This product is not suitable for road use.

Options

Most DCE Parts Downpipes can be specced with a full straight Decat, a Catalytic Converter Look (but with empty cat) or with a High Flow Cat.

DCE Parts introduced a line up of B58 Downpipes that not only offer more performance, but also much nicer sound. The DCE Parts Downpipes are optionally specced with a Catalytic Look while being catless, for enhance sound and a OE/Catted look. The DCE Parts Downpipe can also be fitted with a High-Flow Cat.

Note:

The Catless downpipes and Catless Catalytic Look B58 Downpipes are only suitable for off-road use. The 200 Cell Sport Metallic Catalytic Converter B58 Downpipes are suitable for road use in most Countries. We recommend to check your local law before purchasing the downpipes.

Contact us for more information.

Please check the outlet type of your OEM B58 Downpipe, this part is suitable for vehicle with the OPF & V-Band Flange Type, see image. The difference usually is OPF and no OPF filter.

Please note that the B58 downpipe only fit on cars with OPF and V-Band Flange Type

Please feel free to contact us to ask for the correct fitment.

For the SLIP ON NON OPF variant, please follow this link:

https://www.psr-parts.com/products/dce-parts-b58-downpipe-f-g-chassis-bmw-m140i-m240i-340i-440i-540i-640i-740i-xdrive-slip-on-clamp-type-non-opf