Active Autowerke BMW S58 F97/F98 X3M/X4M Downpipes W Aflow CATs
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Product Details
Upgrade your BMW X3M or X4M with Active Autowerke’s S58 Signature Downpipes. Designed to eliminate the back-pressure of restrictive factory components, these downpipes provide faster turbo spool, increased power, and a high-performance exhaust note without the typical "Check Engine Light" (CEL) headaches.
Performance Engineering
Optimal Flow: Features 3-inch 304 stainless steel piping that transitions to 70mm to match the OEM exhaust system perfectly.
Rapid Spool: High-flow design allows exhaust gases to exit faster, significantly reducing turbo lag.
High-HP Ready: Rated for applications up to 800 HP and built to withstand temperatures up to 1500°F.
Advanced Emissions Technology
No CEL Guarantee: Includes 4.5" Active Aflow catalytic converters, guaranteed not to trigger a CEL for cat efficiency (2-year replacement warranty).
EPA Compliant: 49-state legal and fully OBD2 compliant (excluding California).
High Efficiency: Reaches operational efficiency within just 9 seconds of startup.
Quality & Construction
Durable Build: TIG-welded 304 stainless steel with a furnace-braised 400 CPSI catalyst for long-term reliability.
Easy Installation: Direct bolt-on fitment with cast upper V-bands; no cutting or welding required.
Warranty: 5-year/50,000-mile warranty on the shell/tubing and 2-year/25,000-mile warranty on the catalytic core.
Important Note: These downpipes are not legal for use in California. Warranty is void if the vehicle uses "excessive burble" tunes, as these physically damage the catalytic core.
Not for sale or use in the state of California on any pollution-controlled vehicle as per the California Air Resources Board.
Prop 65 Warning
