ar design's Hi-Flo 3" Premium Downpipes Feature:

• 3" tubing until cat-back flange
• 100% Hand Crafted in the USA - not China - 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 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
• 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
• Do not rattle or cause exhaust alignment headaches like other less expensive N54 downpipes
• Not legal for polution controlled vehicles
  
  

ar design BMW 135 335 535 3" Hi-Flo Downpipes
Included downpipe gasket kit and hardware.