High-Flow Catted Downpipes by Active Autowerke – Compatible with BMW F87 M2 Competition, F80 M3, and F82 M4

Description

The Active Autowerke F8X S55 Downpipes with Active AFlow Catalysts are a high-flow exhaust upgrade engineered for BMW F87 M2 Competition, F80 M3, and F82/F83 M4 models equipped with the S55 twin-turbo engine. These downpipes replace the restrictive factory units with a freer-flowing design that promotes quicker turbo spool, stronger throttle response, and improved horsepower/torque potential without the need for an ECU tune. The included Active AFlow ultra-high-output catalytic converters are EPA-registered and fully OBD2-compliant for most 1996+ vehicles outside California, helping to avoid check-engine lights while increasing flow and performance.

Fitment Notes

• Designed for BMW F87 M2 Competition (S55) chassis.

• Fits BMW F80 M3 and F82/F83 M4 models with the S55 3.0 L twin-turbo engine (2015–2020).

• Direct bolt-on replacement for stock downpipes — uses OEM mounting points and V-band flanges.

• Includes Active AFlow catalytic converters that are EPA-registered and OBD2 compliant in 49 states (not CARB/California legal).

• No performance tune required to avoid check-engine lights when installed and functioning as designed.

Included

• Pair of Active Autowerke downpipes with integrated high-flow Active AFlow catalysts.

• 304 stainless steel V-band flanges for precise OEM-style fitment.

• Mounting hardware and gaskets for direct bolt-on installation.

• Basic installation guidance.

Product Specs

• Material: TIG-welded 304 stainless steel construction for strength and corrosion resistance.

• Catalyst Type: Active AFlow ultra-high output 400 CPSI catalytic converters (EPA registered).

• Fitment: Direct bolt-on downpipe replacement with OEM-matching V-bands and vacuum/O2 sensor ports.

• Performance Rating: Catalysts rated for engines up to approximately 500 hp while providing high flow and emissions control.

• Temperature Tolerance: Withstands exhaust temperatures up to 1500 °F.

• Warranty: 5-year/50,000-mile warranty on shell/tube ends and 2-year/25,000-mile warranty on catalytic core (terms apply).

Product Features

• High-flow Active AFlow catalysts promote freer exhaust flow versus OEM pipes while maintaining emissions compliance in most regions.

• Quicker turbo spool and improved transient response due to reduced backpressure.

• Durable 304 stainless steel construction with TIG welding for long life under thermal stress.

• OEM-compatible V-band flanges and sensor ports ensure a precise, leak-free install.

• No CEL guarantee for catalytic efficiency when functioning as designed (Active AFlow cats), reducing the need for aftermarket tuning.

• EPA registered and 49-state compliant (excludes California/CARB states).

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