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Motion Raceworks


S400 Downpipe Aluminum Flange and V-Band 4"

Racing Use Only, Not Legal for Road Use

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S400 Downpipe Aluminum Flange and V-Band 4"

Motion Raceworks always seeks to maximize functionality and durability while making parts in the USA!  This flange accomplishes all of the above 

Featuring a Marmon flange for T5/T6 style Borg Warner S400 series turbos, this flange transitions to a 4" size for easy downpipe building with a CNC quality flange.  


  • Marmon Flange
  • CNC from Solid 6061 Aluminum
  • Adapts to 4" downpipe size tubing
  • Features Easy weld step for welding 
  • Quick Release Custom Made in the USA V-band clamp

For 5" V-Band assembly version click the link below:  Part Number:  21-11008


For replacement V-Band Clamp click the link below:  Part Number:  21-11005-V