Meet the perfected B9 S4 soundtrack.

• Max gains of 16 hp and 17 ft-lbs of torque at the crank (exhaust)
• Max gains of 23 hp and 27 ft-lbs of torque at the crank (catalyst)
• Available as sophisticated Touring Edition, unleashed Track Edition, and valved SwitchPath™
• Touring Edition Exhausts features AWE’s proprietary drone-canceling 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 the catalyst available separately
• Performance Catalyst features a precision CNC-machined billet T304 stainless steel flange, and 145mm 200CPSI EURO6 HJS HD catalyst with tri-lobe core
• Compatible with standard and sport differentials
• 90mm or 102mm double-walled tips available in chrome silver or diamond black
• 96mm double-walled stainless steel tips with carbon sleeve
• 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 (one year on catalyst core)

SwitchPath™ Exhaust

The SwitchPath™ valved solution is for those who want complete control of their S4’s volume and tone, at their fingertips.

The SwitchPath™ Exhaust comes complete with non-resonated downpipes, a precision-engineered x-pipe mid-section, and two valved muffler sections which can be controlled via the SwitchPath™ Remote.

Sneaking out in the morning? Keep the valve closed.

Ready to rumble? Open the valve and let them know you’re coming.  

Pro tip: we recommend and encourage pairing the SwitchPath™ Exhaust with the SwitchPath™ Remote versus using the factory operation for the best SwitchPath™ experience.

Note: you may notice a slight rattle upon cold start as you would with many factory valved systems. This sound will go away within a few minutes and you will be off to the races in no time.