Active Autowerke Signature Catless Downpipe – BMW B58 F/G Chassis Up to 2024

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 is the catless version for maximum exhaust flow.

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 catless downpipe

TECH RESOURCES

• Off-road / competition use only — the catless downpipe removes the catalytic converter and is not emissions compliant for street use.
• A performance tune is typically required when running catless to address the catalyst efficiency monitor and avoid a check engine light.
• Covered by a 5-year/50,000-mile warranty on shell and tube ends to the original purchaser only.
• For M340i/M440i, pair with the Active Autowerke B58 Charge Pipe; for the 340i/440i (F3x), add the Valved Rear Exhaust.
• This catless version no longer appears in Active Autowerke's current online catalog — contact us to confirm availability before ordering.

VEHICLE APPLICATIONS