AR Design 135I / 335I / 335XI 4″ Hi-Flo™ Catless Downpipe (N55, 2011-)

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About AR Design

AR design creates and sells some of the finest products available for your performance vehicle. Specializing in exhaust components mainly downpipes for the newer turbo BMW motors.

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The only 4" Catless Downpipe On The Market

The only 4″ catless downpipe currently on the market! Built with a carefully made 4″ to dual 2.5″ collector that mates to the factory style exhaust.

Key Features

  • Typical gains with tuning in the 20+hp range!
  • 100% hand crafted in the USA from premium 304 Stainless Steel – flanges and O2 bungs included!
  • Water-jet cut 304 Stainless cat-back flanges, and CNC’d 304 Stainless V-Band flange.
  • 100% TIG welded, argon back-purged.
  • Set of our exclusive bomb-proof exhaust gaskets included.
  • Grade 10.9 Metric Hardware (145,000PSI tensile strength, C32-C39 Rockwell, Zinc Plated), and Nord-Lock positive locking re-usable washers included.
  • Factory location O2 bungs, with an added bung for a wideband O2 sensor!
  • 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.