Active Autowerke Signature Active Aflow Catted Downpipe – BMW B58 F/G Chassis Up to 2024 11-062A

OVERVIEW

The Active Autowerke B58 Signature downpipe utilizes 4.5" diameter stainless steel piping to provide more power, quicker spool, and extreme durability. It then tapers down to 3.5" where a stainless flex joint is incorporated, then down to 80mm to meet the OEM exhaust system — the diameter is never dropped below the stock 80mm. This version is equipped with Active Autowerke's own 4.5" Active Aflow high-flow catalytic converter.

SPECS

• Casted upper stainless steel V-Band for precise fitment
• 4.50" diameter piping allows for maximum power output
• Quicker turbo spool
• Durable construction from TIG welded 304 stainless steel
• Easily bolts on, no cutting or welding required
• Made in Miami, Florida

PARTS INCLUDED

• 1x downpipe with Active Aflow catalytic converter (turbo flange gasket pre-installed)

TECH RESOURCES

• The 4.5" Active Aflow catalytic converter is constructed entirely from 304 stainless steel (including the substrate), is rated for engines up to 800hp, and is EPA registered and OBD2 compliant for 1996-and-newer vehicles.
• 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; warranty is void if the vehicle has excessive burble (greater than stock), as this physically destroys the catalytic core.
• No performance tune is required to run this downpipe (per Active Autowerke).
• For M340i/M440i, pair with the Active Autowerke B58 Charge Pipe; for the 340i/440i (F3x), add the Valved Rear Exhaust.
• Catalytic converter break-in procedure (PDF)

PART NUMBER

• 11-062A

VEHICLE APPLICATIONS