B58 Downpipe 2016 – 2022 BMW M240i/340i/440i/540i/740i/840i & xDrive

Welcome to WeldAffection, brilliantly designed by taking the best assets of our original Downpipes and adding some new design features. We have achieved the ultimate goal: performance.
WeldAffection Downpipes are a direct fit with no modification required. Our decatted Downpipes are fitted with OEM flanges and fittings to allow for easy, trouble-free installation.
We are proud to introduce our WeldAffection race & high-flow catted Downpipe for your B58 M240i, 340i, 440i, 540i, 740i & xDrive variants. These Downpipes are the best bang-for-the-buck mod available for your B58, and they’re offered in both race and high-flow Downpipe configurations.

WeldAffection B58 Stainless Steel Downpipe is made from:

• Hand-crafted, TIG-welded 4.5″ 304-grade stainless steel

• Available with a 200-cell high-flow cat

• Highest quality 2.0mm wall 304L stainless steel

• Inlet diameter: 114mm

• Outlet diameter: 90mm

• Fits RHD and LHD models with no modification necessary

• Smooth radius bends to decrease turbulence and increase flow

• Fits the stock cat-back as well as all aftermarket cat-backs

• Gains from 25–30 hp with tune

This Downpipe fits the following BMWs:
F Series 140i, 240i, 340i, 440i, 540i, 640i, and 740i including xDrive.