The 2013 Audi S4 is the performance trim of the B8 A4 lineup, equipped with the 3.0L Supercharged V6 engine producing 333 horsepower and 325 lb-ft of torque. The S4 exhaust system is more than a luxury sedan exhaust, it is a performance-engineered system tuned for the supercharged V6's specific power band and the S4's character as a sport sedan. The system uses dual outlet routing with two mufflers and two tailpipes (or four tips in some packages), delivering the S4's signature exhaust note that balances refinement with performance.
The most common 2013 S4 exhaust replacement triggers are: failed catalytic converter (P0420 or P0430 codes, expensive on a supercharged engine), rusted-through muffler or mid-pipe (typical past 8 years in salt-belt states), leaking flange connections, or upgrading to an aftermarket cat-back for better sound and a measurable performance gain. Aftermarket S4 cat-back exhausts typically deliver 10 to 20 hp gain plus a more aggressive supercharger whine through the cabin.
| Option | Description |
|---|---|
| Cat-Back System | Replaces everything from the catalytic converter back. Includes mid-pipe, resonator, dual mufflers, and dual tailpipes. The most common upgrade choice for S4 owners. |
| Axle-Back System | Replaces only from the rear axle back. Just the dual mufflers and tailpipes. Less expensive and easier install, smaller sound change. |
| Full Exhaust | Replaces everything from the engine back, including downpipes and catalytic converters. Required when cats are failed. Highest cost. |
| Item | Details |
|---|---|
| INCLUDED | The exhaust system you order: complete (manifold-back), cat-back (catalytic converter to dual tailpipes), axle-back (dual mufflers and dual tailpipes), or individual component. New gaskets and clamps included. |
| NOT INCLUDED | Heat shields (sometimes included, varies by configuration), engine mounts, oxygen sensors (sold separately), exhaust hangers (typically reuses car's hardware), tools. |
| Tools You Need | Standard hand tools, oxygen sensor socket, penetrating oil, jack and stands or lift, exhaust hanger removal tool, torque wrench. |
The 2013 Audi S4 exhaust system is compatible with the following:
| Vehicle | Compatibility |
|---|---|
| 2013 Audi S4 Sedan 3.0T quattro | All trim levels |
| 2013 Audi S4 Avant 3.0T quattro | Wagon (where offered) |
| 2010 to 2012 Audi S4 (B8) | Same exhaust geometry, confirm year at order |
| 2014 to 2016 Audi S4 (B8 facelift) | Same exhaust geometry, confirm year at order |
NOT compatible: 2009 and earlier S4 (B7 chassis, V8 engine, different exhaust entirely), 2017 onward S4 (B9 chassis, twin-turbo V6, different exhaust). Also not compatible with regular A4 trims (use the 2014 Audi A4 Exhaust page for those).
This is a new 2013 Audi S4 exhaust system in OEM specification. Quality control includes:
This is a new exhaust system, not used. We do not sell used exhausts. New systems only.
| Application | 2013 Audi S4 (B8 chassis facelift) |
|---|---|
| Engine Compatibility | 3.0L Supercharged V6 (333 hp | 325 lb-ft) |
| Drivetrain | quattro AWD (only configuration) |
| Body Styles | Sedan | Avant (where offered) |
| Configuration | Dual outlet exhaust | performance-tuned |
| Material | Stainless steel construction |
| Tip Style | Dual chrome (quad-tip on certain packages) |
| Dot Compliance | Yes | EPA-approved dual catalytic converters |
| Performance Benefit | 10 to 20 hp gain on aftermarket cat-back |
| Sound Profile | Sportier S4 tone | supercharger whine accent |
| Service Life | 10+ years with proper maintenance |
| Price | $649.00 (cat-back system) |
B8 facelift S4, needed a cat-back after the factory mid-pipe rusted from years of mountain road salt. Vaz confirmed cross-compatibility with 2014 S4 and shipped the right unit. Stainless steel construction looks like it will outlast the car. Sound is noticeably better, slight performance bump felt under boost.
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Every 2013 Audi S4 exhaust system sold by Vaz Auto Solutions is covered by a 15 day replacement warranty from the date of delivery.
To file a claim, contact us within 15 days of delivery at (240) 301-0095 or support@vazautosolutions.com.
