From the masters of S4 performance, AWE proudly presents the B9 S4 exhaust solution. Signature AWE tone, performance, and options for every taste and budget.

• Max gains of 16 hp and 17 ft-lbs of torque at the crank (exhaust)
• Available as sophisticated Touring Edition, unleashed Track Edition, and valved SwitchPath™
• Touring Edition Exhausts feature AWE's proprietary drone-cancelling solution, 180 Technology®
• SwitchPath™ Exhaust can be controlled with optional handheld remote, or factory valve programming
• Downpipes and precision-engineered x-pipe included in all editions
• Specifically engineered downpipe resonators for use with aftermarket catalysts available separately
• Compatible with standard and sport differentials
• 102mm double-walled tips available in chrome silver or diamond black
• Proudly engineered, designed, and manufactured in-house at AWE, in the USA
• Less is more: clean, straight-through design maximizes performance
• Handcrafted from dual 2.5” CNC mandrel-bent U.S.-sourced .065” wall T304L stainless steel
• Direct bolt-on system, factory-like install simplicity
• Perfect fitment - guaranteed
• No Check Engine Light - guaranteed
• Featuring the AWE Lifetime Exhaust Warranty

FROM THE MASTERS OF 3.0T PERFORMANCE:

AWE proudly presents the B9 S4 exhaust solution—signature AWE tone, performance, and options for every taste and budget.

THE VALVED SWITCHPATH™:

The SwitchPath™ valved solution gives you complete control of volume and tone at your fingertips. Includes non-resonated downpipes, a precision-engineered X-pipe mid-section, and two valved mufflers, controllable via the factory setup or the optional AWE SwitchPath™ Remote.

Sneak out quietly with the valves closed, or open them to unleash full 3.0T fury.

Comes with 102mm slash-cut, double-walled tips in Chrome Silver or Diamond Black, each featuring the AWE logo and adjustable for bumper depth.

Note: A slight valve rattle may occur at cold start and fade within minutes, just like the factory exhaust.
 

THE TOURING EDITION:

The Touring Edition removes factory valving and introduces AWE’s drone-canceling 180 Technology® resonators and valve simulators. Civil during cruising, aggressive during throttle, with all the crackles you crave.

Note: This system gets rowdy—especially in the midrange and at cruise. Not returnable based on sound preference.
 

THE TRACK EDITION:

The most aggressive system in the lineup. The Track Edition replaces all resonators with straight pipe sections, keeping only the X-pipe for balance.

Includes non-resonated downpipes and delivers constant volume and raw tone.

Warning: This system gets loud and is not returnable based on sound preference.

Comes with 102mm slash-cut, double-walled tips (Chrome Silver or Diamond Black), AWE logo etched, and individually adjustable.
 

SWITCHPATH™ REMOTE:

The AWE SwitchPath™ Remote offers push-button control over your exhaust valves, bypassing factory Drive Select behavior. Open or close valves at will—anytime, anywhere.

Includes two remotes, control box, and hardware for a plug-and-play installation.

100% EMISSION-FRIENDLY:

AWE Exhausts do not interfere with any factory emissions equipment.

MADE IN PA, USA:

Engineered, designed, and manufactured in-house at AWE using US-sourced .065”-wall T304L stainless steel to achieve a tone deeper than everyone else.

THE FINE PRINT:

AWE’s Perfect Fitment Guarantee, No CEL Guarantee, and Lifetime Warranty all come standard. Track Editions can not be returned for sound reasons (but you can do a conversion kit to Touring Edition at any time!).

Have questions? Click “Ask An Expert” above.

Download:

Installation Instructions for the AWE Track/Touring Exhaust for Audi B9/B9.5 S4 3.0T

Installation Instructions for the AWE SwitchPath Exhaust for Audi B9/B9.5 S4 3.0T

Dyno Tests: AWE Exhaust Suite for Audi B9/B9.5 S4 3.0T

Below are comparison dyno tests as performed on our Mustang MD-500-SE AWD dyno.

Wheel horsepower gains for the AWE Exhaust Suite for Audi B9/B9.5 S4 3.0T

What is 180 Technology®?

AWE's patented 180 Technology® works a little something like this: As exhaust gases exit the engine and flow into an AWE 180 Technology®-equipped resonator, they pass through strategically located ports, and into reflection chambers.

Sound waves, carried by these exhaust gasses, bounce off the walls of the reflection chambers. Depending on the sound requirements of each vehicle, AWE acoustic engineers adjust the size and location of the ports and the chambers. By controlling the size and location of these key elements, we also control when the sound waves exit the chambers. The specific timing of when the reflected sound waves re-join the main exhaust flow creates a one-hundred-and-eighty-degree out-of-phase sound wave that cancels out problematic frequencies.

Consistency through change.

AWE 180 Technology® is not on a “one size fits all” concept. Rather, AWE engineers design sound cancelation resonators based upon the specific acoustics generated by vehicle types, thereby ensuring perfect sound, every time. It’s one of the reasons AWE exhausts have earned a reputation for the perfect tone, regardless of application.

What it means to you.

The result? The removal of unwanted tones in all AWE 180 Technology®-equipped exhaust systems. The sound produced by this formula is the perfect, signature note. Unlocked performance and spot-on tone, every time.

A video´s worth 1,000,000 words.

180 Technology® in action, below.

Questions about AWE's patented 180 Technology®? We're here.