Audi S4 B6 B7 4.2L V8 2.5" High Flow Catted Downpipes
2.5" performance downpipes with 200-cell high-flow catalytic converters and pre-cat delete design for the 2004-2008 Audi S4 B6/B7 4.2L V8 Quattro.
More Flow. More V8 Sound. Less Exhaust Restriction. Serious XS-POWER Value.
Wake Up Your Audi S4 4.2L V8
The Audi B6 and B7 S4 came from the factory with one of Audi's great naturally aspirated engines: the 4.2L V8. Unfortunately, the factory exhaust system also places substantial exhaust hardware immediately downstream of that engine.
XS-POWER developed these 2.5" Audi S4 performance downpipes as a cost-effective way to upgrade the exhaust path while retaining 200-cell high-flow catalytic converters.
The factory-style configuration uses both an upstream pre-catalyst and a main catalytic converter on each downpipe. These XS-POWER downpipes eliminate the restrictive pre-cat configuration and use a 200-cell high-flow catalytic converter in each downpipe.
The result is a performance-oriented B6/B7 S4 exhaust upgrade designed to provide a freer-flowing exhaust path and a stronger, more aggressive 4.2L V8 exhaust character without requiring a completely catless downpipe setup.
Why Upgrade the Factory B6/B7 S4 Downpipes?
One of the most popular areas to address when upgrading the exhaust on the Audi S4 4.2L V8 is the downpipe section.
The factory configuration contains two catalytic converter sections per downpipe: an upstream pre-cat positioned relatively close to the engine and a downstream main catalytic converter.
Removing the upstream pre-cat from the performance exhaust path reduces an area of restriction near the beginning of the exhaust system. The XS-POWER design then uses a 200-cell high-flow catalyst farther downstream.
For the enthusiast, this provides an excellent combination of exhaust flow, V8 sound and value.
XS-POWER B6/B7 S4 Downpipe Features
- 2.5" performance downpipe system
- Designed for the Audi B6/B7 S4 4.2L V8
- 200-cell high-flow catalytic converters
- Pre-cat delete performance design
- Designed for improved exhaust flow compared with the restrictive factory configuration
- More aggressive 4.2L V8 exhaust character
- Excellent upgrade for naturally aspirated B6/B7 S4 performance builds
- Designed to attach to the stock or stock-replacement exhaust configuration
- Suitable for Sedan and Avant applications when equipped with the listed 4.2L V8 drivetrain
- Performance-oriented alternative to much more expensive aftermarket downpipe systems
- XS-POWER / SSAutoChrome performance exhaust engineering
Let The 4.2L V8 Be Heard
The Audi 4.2L V8 has an unmistakable exhaust note, and freeing up the downpipe section allows more of that character to come through the exhaust system.
These XS-POWER downpipes are designed for enthusiasts looking for a deeper, more aggressive performance exhaust character while maintaining high-flow catalytic converters.
Pair them with the factory exhaust, a stock-replacement exhaust, or a compatible performance cat-back to build the B6/B7 S4 exhaust combination you want.
Audi S4 Fitment
| Make | Model | Chassis | Engine | Years | Drivetrain |
|---|---|---|---|---|---|
| Audi | S4 | B6 | 4.2L V8 | 2004-2005 | Quattro |
| Audi | S4 | B7 | 4.2L V8 | 2005.5-2008 | Quattro |
Body Styles: Applicable B6/B7 S4 Sedan and Avant configurations.
IMPORTANT: Verify your vehicle year, chassis, engine, transmission, existing exhaust configuration and product photographs before ordering. Modified vehicles and non-original exhaust systems may require additional adjustment or fabrication.
Technical Specifications
| Brand | XS-POWER / SSAutoChrome |
| Product | Performance Downpipe Set |
| Pipe Size | 2.5" |
| Catalyst | 200-Cell High-Flow Catalytic Converters |
| Pre-Catalysts | Deleted |
| Engine | Audi S4 4.2L V8 |
| Chassis | B6 / B7 |
Performance Without the $1,700 Downpipe Price Tag
Why spend approximately $1,700 on another brand's downpipe system when XS-POWER offers enthusiasts a performance-focused 2.5" high-flow catted solution at a fraction of the cost?
That is what XS-POWER has always been about: serious performance without the inflated price.
What You Receive
- Left-side 2.5" performance downpipe assembly
- Right-side 2.5" performance downpipe assembly
- Integrated 200-cell high-flow catalytic converters
- Components and hardware shown in the product photographs
What you see in the product photographs is what is included.
Installation Notes
Professional installation is strongly recommended. Exhaust fasteners on older B6/B7 S4 vehicles may be heavily heat-cycled, corroded or difficult to remove.
Always inspect exhaust gaskets, mounting hardware, oxygen sensors and adjoining exhaust components during installation. Verify clearance and check the complete exhaust system for leaks before operating the vehicle under load.
Audi B6 S4 and B7 S4 4.2 V8 High Flow Catted Downpipes
Searching for Audi B6 S4 downpipes, B7 S4 downpipes, Audi S4 4.2 exhaust upgrades, B6 S4 piggie pipes, B7 S4 piggy pipes, Audi S4 high-flow cats, 2.5 inch Audi downpipes, B6 S4 pre-cat delete downpipes, B7 S4 catted downpipes, Audi S4 Avant downpipes, Quattro performance exhaust or 4.2 V8 downpipes? This XS-POWER system is designed specifically around the B6/B7 S4 4.2L V8 platform.
XS-POWER has supplied Audi and European performance enthusiasts with turbo, intake and exhaust components for years. These high-flow catted downpipes continue that philosophy by combining performance-focused design with enthusiast-level pricing.
Frequently Asked Questions
Will these fit a B6 Audi S4 4.2L V8?
They are designed for the 2004-2005 B6 Audi S4 4.2L V8 application listed above.
Will these fit a B7 Audi S4?
They are also listed for 2005.5-2008 B7 Audi S4 models equipped with the 4.2L V8.
Do these downpipes have catalytic converters?
Yes. Each downpipe incorporates a 200-cell high-flow catalytic converter.
Do these retain the factory pre-cats?
No. These are a pre-cat delete design intended to reduce restriction in the upstream exhaust path.
Will these fit an Audi S4 Avant?
The system is intended for applicable B6/B7 S4 4.2L V8 configurations, including Avant applications. Always verify the vehicle and existing exhaust configuration before ordering.
Can I use these with the factory exhaust?
They are designed to connect to the stock or compatible stock-replacement exhaust configuration.
Will 200-cell catalytic converters guarantee an emissions inspection pass?
No. Inspection and emissions requirements vary by location and vehicle. High-flow catalytic converters do not guarantee emissions compliance or prevent a check-engine light. Confirm all applicable regulations before purchase and installation.
XS-POWER Audi S4 4.2L V8 Performance
2.5" Downpipes. 200-Cell High-Flow Cats. No Pre-Cats. More Flow. More V8 Sound. Serious Performance Without the $1,700 Price Tag.
