2013 Audi S4 Exhaust | Dual Outlet Cat-Back System for 3.0T Supercharged
Product Overview
- Condition: New OEM-specification components
- Availability: Complete system and individual components available
- Shipping: Free crated freight to all 50 states, 5 to 10 business days
- 3.0T Supercharged engine and B8 chassis confirmed before shipping
- All components inspected and pressure-tested before packaging
- Stainless steel construction for long service life
- Dual catalytic converters verified DOT and EPA compliant
- 100% fitment verified before every order ships
- Backed by a 15 day replacement warranty against manufacturing defects
Description
About the 2013 Audi S4 Exhaust
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.
Why 2013 S4 Owners Replace the Exhaust
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.
Cat-Back vs Axle-Back vs Full Exhaust on the S4
| 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. |
Things to Confirm Before Ordering Your S4 Exhaust
- Year (2010 to 2016 B8 S4 share the same exhaust geometry within engine match)
- Body style (Sedan or Avant, where Avant was offered)
- Component scope (complete system, cat-back, axle-back, or individual)
- Tip style preference (dual round, dual oval, quad tip)
- Sound preference (mild factory replacement vs sportier aftermarket tone)
What Ships and What Does Not
| 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. |
Direct-Fit Vehicle Applications
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).
Quality Control Workflow
This is a new 2013 Audi S4 exhaust system in OEM specification. Quality control includes:
- Stainless steel weld integrity inspection at every joint
- Flange flatness verification on manifold and mid-pipe connections
- Dual catalytic converter substrate inspection (no cracks or melting)
- Both muffler internal baffle integrity check
- Dual tip alignment and chrome finish inspection
- Pressure test on completed dual-system assembly before packaging
This is a new exhaust system, not used. We do not sell used exhausts. New systems only.
Why Buy From Part Nests
- New OEM-specification 2013 Audi S4 exhaust system from established manufacturers
- 3.0T Supercharged engine match confirmed for your S4
- Component scope (cat-back, axle-back, full system) matched to your need
- Dual outlet routing verified for S4-specific configuration
- All components inspected and pressure-tested before shipping
- Free crated freight to all 50 states, no hidden surcharges
- 15 day replacement warranty on manufacturing defects
- Dual catalytic converters verified DOT and EPA compliant
- Call (240) 306-7051 to speak with someone who knows S4 supercharger exhaust dynamics, dual-outlet routing options, and B8 S4 year cross-compatibility
Additional information
| 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 | Avant (where offered), Sedan |
| configuration | Dual outlet exhaust, performance-tuned |
| material | Stainless steel construction |
| tip-style | Dual chrome (quad-tip on certain packages) |
| dot-compliance | EPA-approved dual catalytic converters, Yes |
| 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) |
Cat-back replaces everything from the catalytic converter back, including mid-pipe, resonator, dual mufflers, and dual tailpipes. The most common upgrade choice for S4 owners. Axle-back replaces only from the rear axle back: just the dual mufflers and tailpipes. Less expensive, easier install, smaller sound change. Full exhaust replaces everything from the engine back, including downpipes and catalytic converters. Highest cost but required when cats are failed.
Yes. The 2010 to 2016 S4 (B8 chassis) shares the same exhaust geometry within engine match. A 2013 S4 cat-back fits a 2011 S4. We confirm year on every order.
Typically 10 to 20 horsepower with a quality cat-back system. The supercharged 3.0T is more sensitive to exhaust backpressure than the smaller 2.0T, so gains are modestly higher than on the A4. The cat-back also lets more of the supercharger whine through to the cabin, which most S4 owners specifically want.
No. The S4 exhaust uses dual outlet routing with two mufflers and two tailpipes. The standard A4 exhaust uses single-outlet routing. The chassis hangers, mounting points, and exhaust geometry are different. Use the 2014 Audi A4 Exhaust page for regular A4 trims.
Engine and exhaust architecture. The 2004 to 2009 B7 S4 used a 4.2L naturally aspirated V8 with completely different exhaust manifolds, downpipes, and rear-end routing. The 2010 to 2016 B8 S4 uses the 3.0T Supercharged V6 with this batch's exhaust system. The two are not interchangeable. Always confirm chassis generation before ordering.
No. The 2017 onward S4 is the B9 chassis with a twin-turbo 3.0L V6 (no longer supercharged). The B9 S4 exhaust is completely different from this B8 system. Confirm chassis generation when ordering.
The federal Magnuson-Moss Warranty Act protects you from blanket warranty denials based on aftermarket parts. However, individual dealers may decline warranty claims if a specific failure is traced to the aftermarket exhaust. Most S4 owners outside factory warranty proceed without concern. For cars under warranty, discuss with your dealer or consider a non-CARB-compliance issue.
Yes for visual and acoustic authenticity. The S4 dual-outlet routing is part of the car's character. Single-outlet routing on an S4 visually misrepresents the trim and acoustically changes the supercharger note significantly. Aftermarket S4 cat-back systems all maintain the dual-outlet configuration.
15 Day Replacement Warranty
Every new 2013 Audi S4 exhaust system purchased through Part Nests carries a 15 day replacement warranty starting on the delivery date.
What Is Covered
- Manufacturing defects in welding, flange flatness, or material integrity
- Catalytic converter substrate defects beyond what was disclosed
- Muffler baffle or chrome finish defects from manufacturing
- Incorrect part shipped due to an error on our end
What Is Not Covered
- Damage caused during installation
- Damage from operating with faulty or removed oxygen sensors
- Damage from supercharger malfunction affecting exhaust temperature
- Labor expenses of any kind
To start a warranty claim, reach us within 15 days of delivery at (240) 306-7051.
- New OEM-Specification Build: Not used, manufactured to factory geometry
- 3.0T Supercharged Match Confirmed: S4-specific engine verified
- Dual Outlet Routing: S4-specific configuration verified before payment
- Stainless Steel Construction: Welds inspected at every joint
- Dual Cats DOT and EPA Verified: Both catalytic converters compliant
- 15 Day Replacement Cover: Manufacturing defects protected from delivery onward
2 reviews for 2013 Audi S4 Exhaust | Dual Outlet Cat-Back System for 3.0T Supercharged
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At Part Nests, we specialize in high-quality used and OEM auto parts, with a wide selection of components ready to ship to customers.
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Bryce S. –
Got a cat-back system for a 2013 S4. 3.0T Supercharged engine match confirmed, dual outlet routing verified for the S4-specific configuration, dual cats verified DOT and EPA compliant. Stainless welds inspected at every joint. Sound change is exactly what I wanted, more supercharger whine in the cabin without being obnoxious.
Trevor H. –
Sourced an S4 cat-back for a 2014 S4 Avant build. Year cross-compatibility confirmed (2010 to 2016 B8 share geometry), body style (Avant) noted. Performance gain measurable on the dyno, sound character spot-on for an aggressive but liveable daily.