BMW G Series B58 Downpipe

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 an 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 available in both race & high flow configurations.

WeldAffection B58 Stainless Steel Downpipe is made from:

• Handcrafted, 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 catback as well as all aftermarket catbacks.
• Gains from 25-30hp with tune.
  
  

This downpipe fits the following BMWs:

G Series 140i, 240i, 340i, 540i, 640i, and 740i including xDrive.