Active Autowerke Active Aflow Catted Downpipes – BMW S58 F97/F98 X3M/X4M 11-070A

OVERVIEW

Active Autowerke offers a performance downpipe upgrade specifically engineered for the BMW S58 engine in the F97/F98 X3M and X4M models. This version is equipped with a pair of 4.5" Active Aflow high-flow catalytic converters.

SPECS

• Constructed from TIG welded 304 stainless steel with 1.5mm wall thickness for durability
• Features 3 inch diameter piping to reduce exhaust restriction and improve turbo spool
• Includes stainless flex joints, maintaining a minimum 70mm diameter to match OEM exhaust
• Precision fitment with bolt-on installation
• Manufactured in Miami, Florida

PARTS INCLUDED

• 1x downpipe set with Active Aflow catalytic converters

TECH RESOURCES

• The pair of 4.5" Active Aflow ultra-high-flow catalytic converters (400 cells per square inch) are constructed from 304 stainless steel, rated for engines up to 800hp, withstand temperatures up to 1500°F, and are EPA registered and OBD2 compliant for 1996-and-newer vehicles — designed to run without a catalytic-efficiency check engine light.
• Not legal for use on vehicles registered in California per California Vehicle Code Section 27156 and 38391 — meets EPA (not CARB) emissions standards.
• Covered by a 5-year/50,000-mile warranty on shell and tube ends and a 2-year/25,000-mile warranty on the catalytic core to the original purchaser only.
• No performance tune is required to run this downpipe (per Active Autowerke).
• Minimizes back pressure on the turbochargers using a straightforward design with minimal bends, enhancing turbo spool speed and overall power potential.
• Completes the Active Autowerke X3M/X4M exhaust system — pair with a mid-pipe (Single or Equal Length) and the Valved Rear Axle-Back Exhaust.
• Catalytic converter break-in procedure (PDF)

PART NUMBER

• 11-070A

VEHICLE APPLICATIONS