Active Autowerke High-Flow Catted Downpipes – Compatible with BMW F90 M5, F92 M8, and F93 M8

Description

The Active Autowerke Catted Downpipes for the BMW F90 M5, F9X M8, X5M, and X6M are a high-flow exhaust upgrade engineered to unlock more power and responsiveness from your S63TU twin-turbo engine. These downpipes dramatically reduce the restrictive characteristics of the factory units, promoting quicker turbo spool, improved throttle response, and increased horsepower and torque throughout the RPM range — all while retaining emissions capability and minimizing check-engine-light issues when used with the included high-flow catalysts. Built from premium materials with precision fitment, this upgrade is ideal for enthusiasts who want measurable performance gains and a more engaging driving experience.

Fitment Notes

• Designed specifically for BMW F90 M5 (2018+) and BMW F9X M8 (2019+).

• Also fits BMW X5M (F95) and BMW X6M (F96) applications when equipped with the S63TU engine.

• Direct bolt-on downpipe replacement — no cutting, welding, or fabrication required.

• Accepts OEM O2 sensor heat shields to retain a stock-like engine bay appearance.

• Includes high-flow catalytic converters designed to avoid CEL and maintain OBD2 compliance in most regions (excluding California).

• Not legal in California or other CARB-regulated states due to emissions equipment requirements.

Included

• Pair of high-flow catted downpipes specifically engineered for S63TU engines.

• GESI Ultra High Output catalytic converters (4.5″) to maintain emissions functionality and help prevent a check-engine light.

• OEM-compatible mounting flanges, gaskets, and hardware for a complete install.

• Installation instructions for straightforward bolt-on fitment.

Product Specs

• Piping Diameter: 4.50″ high-flow mandrel-bent construction for improved exhaust velocity.

• Material: TIG-welded 304 stainless steel for corrosion resistance and long-term durability.

• Catalyst Type: GESI Ultra High Output 400 CPSI catalysts, EPA registered and 49-state compliant.

• Fitment: Direct bolt-on downpipe replacement with factory-matched 3.5″ V-band connections.

• Power Handling: Rated for applications up to 500–850 hp, suitable for stock and tuned engines.

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

• Compliance: OBD2 compliant for no CEL in most states; not CARB approved in California.

• Warranty: Typically includes a 5-year/50,000-mile warranty on housing and a 2-year/25,000-mile warranty on catalytic core (varies by retailer).

Product Features

• High-flow catalytic converters help maintain emissions compliance without triggering a check-engine light in most OBD2 vehicles.

• Significantly reduced turbo lag and quicker turbo spool thanks to free-flowing downpipe design.

• Improved horsepower and torque across the powerband by eliminating restrictive stock sections.

• 304 stainless steel construction with TIG welding ensures durability and resistance to high temperatures.

• Direct bolt-on fitment with OEM-matched V-bands and heat-shield compatibility for simpler installation and stock aesthetics.

• EPA registered and OBD2 compliant in 49 states (excludes California) for broad legality outside CARB jurisdictions.

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