Custom Downpipe Fits for BMW B58 Motor M140i M240i 340i 440i 540i 740i X3 X5 F20 F23 F30 F33 G30 G11 4.5inch Stainless Steel Pipe

Downpipe Upgrade 2016+ BMW M240i 340i 440i 540i 740i xDrive

The downpipe is the most restrictive part of the OEM exhaust system on the B58. And that’s why people upgrade it. Less restriction = more power!

Feature:

I’ll keep it light on the technical detail – but – at a high level, you want a lot of air pressure before the turbo, and zero air pressure after the turbo. The higher the air pressure is before it enters the turbo, the less work the turbo has to do (more efficient). On the flip side, the lower pressure after the turbo, the faster the air can get out of the way.
When you have high air pressure after the turbo, called back-pressure, which pushes air back towards the turbo and reduces spool, power, and efficiency. Here is my most simplistic explanation:
When your turbo dumps a bunch of air into the downpipe, but the downpipe is restrictive, the air bounces back from the downpipe to the turbo. This bounce back creates resistance for the turbo compressor, which reduces spool.

Applicable:

M140i / xDrive 2016-2019 F20
M240i / xDrive 2016-2019 F22/F23
340i / xDrive 2016-2019 F30/F31
440i / xDrive 2016-2019 F32/F33/F36/G22/G23/G26
540i / xDrive 2017-2019 G30/G31
740i / xDrive 2016-2019 G11/G12


TOYOTA SUPRA A90 2020
TOYOTA SUPRA A91 2021 - 2022

Package:

1set x Downpipe