We are thrilled to present our new 135i / 335i / 335xi Hi-Flow catted downpipe for the BMW N55 engine! The only downpipe on the market with a large 5" body heavy-metal catalyst. These downpipes add significant power and help eliminate turbo lag.
Our Hi-Flow 5" Race-Catted Downpipe Features:
The only catted downpipe with a 5" heavy metal catalyst currently on the market! Built with a carefully made collector that mates to the factory style exhaust.
Typical gains with tuning in the 15+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, additional bungs for a wideband 02 sensor available.
Available with a 2000Â°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.
All AR Design products are built with Magnaflow OBD-2 EPA certified Converters.