Magnaflow Cat Back Exhaust 2.5in 4.2L V8 Audi S5 Coupe

Cat-back performance exhaust for the 2008–2012 Audi S5 4.2L V8 that improves exhaust flow and delivers a more aggressive exhaust character for clearer throttle response and consistent performance.

This MagnaFlow Sport Series Cat-Back Performance Exhaust System (part number 16598) is engineered to replace the factory exhaust path with a 2.5" mandrel-bent main pipe designed to reduce backpressure and support a high-flow exhaust note while retaining reliable fitment for the S5 platform.

• 2.5" diameter fast-flowing mandrel-bent main pipe — Mandrel bends preserve internal diameter through bends, which minimizes flow restriction and helps maintain exhaust scavenging for improved midrange response.
• Sport Series Cat-Back configuration — Replaces the factory rear section without modifying the turbo or mid-pipe layout, providing a direct performance exhaust upgrade that focuses on sound and flow.
• Application-specific tuning — Designed for the 2008–2012 Audi S5 4.2L V8 coupe to ensure proper routing and fitment while delivering the intended acoustic character and flow characteristics for that engine.
• MagnaFlow engineering and reputation — Manufactured by MagnaFlow, a known supplier of performance exhaust systems, emphasizing consistent manufacturing quality and materials selection appropriate for performance use.

Why this matters: the combination of a defined 2.5" high-flow main pipe and a cat-back layout reduces exhaust restriction compared with typical factory rear sections, which can sharpen throttle response and provide a more pronounced exhaust tone without altering the vehicle's mid-section or requiring additional hardware.

Compatibility notes: specifically specified for the 2008–2012 Audi S5 with the 4.2L V8 engine in coupe configuration. Refer to part number 16598 for verification against your vehicle build and production year.