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.


3" Tubing Until Cat-Back Flange

The only TRUE 3″ catless downpipes currently on the market! 3″ tubing until cat-back flange – all systems currently on the market reduce to 2.5″ much closer to the turbocharger.

Key Features

  • 100% hand crafted in the USA from premium 304 Stainless Steel – flanges and O2 bungs included!
  • Typical gains with tuning in the 30bhp range!
  • Water-jet cut 304 Stainless cat-back flanges, and CNC’d 304 Stainless V-Band flanges.
  • 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
  • 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.