Fitment for the following cars:

  • F30 320i Sedan
  • F30 320iX Sedan
  • F30 328i Sedan
  • F30 328iX Sedan
  • F31 328i Touring
  • F31 328iX Touring
  • F32 428i Coupe
  • F32 428iX Coupe
  • F34 328i Gran Turismo

Our Hi-Flo™ 4" Catless Resonated Downpipes Feature:

  • Typical gains with tuning in the 20+whp range!
  • 100% hand crafted in the USA from premium 304 Stainless Steel - flanges and O2 bungs included!
  • CNC'd 304 Stainless V-Band flange.
  • 100% TIG welded, argon back-purged.
  • Available with a 2000°F ceramic coating. Coatings come with a 3 year warranty against corrosion and rust to original owner.
  • Lifetime warranty against any manufacturing defects given to original owner.
  • AR Design does NOT grind/polish our welds as some other manufacturers do. Grinding welds compromises the strength of the weld, and can lead to weld failure! Especially critical in applications exposed to temperatures in excess of 1200°F. Such temperatures will  also rapidly deteriorate the polished finish.


AuthorKelvin Fung