The Twin1 exhaust system uses only one mid muffler and no rear muffler for S4 drivers looking for a louder, more aggressive sounding exhaust system. Though the Twin1 uses only one muffler instead of the two found in our Twin2 system, there is absolutely no drone at any engine speed. And the sound at full throttle is incredible!

With the AWE Tuning Twin1 and Twin2 S4 Exhaust Systems, you've found the finest exhaust systems available for the Audi S4. Both systems offer outstanding performance from a true dual tubing configuration, with a choice of sound levels to meet your desires.

AWE has spent considerable time examining how to maximize the performance and options of this exhaust system. The AWE Tuning exhaust boasts features you will not find on any other system on the market, ensuring unmatched power, fitment, and sound levels.

AWE has spent considerable time examining how to maximize the performance and options of this exhaust system. The AWE Tuning exhaust boasts features you will not find on any other system on the market, ensuring unmatched power, fitment, and sound levels.

AWE has spent considerable time examining how to maximize the performance and options of this exhaust system. The AWE Tuning exhaust boasts features you will not find on any other system on the market, ensuring unmatched power, fitment, and sound levels.

AWE has spent considerable time examining how to maximize the performance and options of this exhaust system. The AWE Tuning exhaust boasts features you will not find on any other system on the market, ensuring unmatched power, fitment, and sound levels.

Developed in-house on AWE AWD dynamometer, with a critical ear lent to sound volume and tone character, AWE guarantees the most flexible and powerful exhaust system yet for this great car. Featuring their distinctive double walled taper tips in a 3.5" (90mm) diameter, this system looks fantastic on the car.

Developed in-house on AWE AWD dynamometer, with a critical ear lent to sound volume and tone character, AWE guarantees the most flexible and powerful exhaust system yet for this great car. Featuring their distinctive double walled taper tips in a 3.5" (90mm) diameter, this system looks fantastic on the car.

Developed in-house on AWE AWD dynamometer, with a critical ear lent to sound volume and tone character, AWE guarantees the most flexible and powerful exhaust system yet for this great car. Featuring their distinctive double walled taper tips in a 3.5" (90mm) diameter, this system looks fantastic on the car.

Developed in-house on AWE AWD dynamometer, with a critical ear lent to sound volume and tone character, AWE guarantees the most flexible and powerful exhaust system yet for this great car. Featuring their distinctive double walled taper tips in a 3.5" (90mm) diameter, this system looks fantastic on the car.

AWE has spent considerable time examining how to maximize the performance and options of this exhaust system. The AWE Tuning exhaust boasts features you will not find on any other system on the market, ensuring unmatched power, fitment, and sound levels.

AWE has spent considerable time examining how to maximize the performance and options of this exhaust system. The AWE Tuning exhaust boasts features you will not find on any other system on the market, ensuring unmatched power, fitment, and sound levels.

AWE has spent considerable time examining how to maximize the performance and options of this exhaust system. The AWE Tuning exhaust boasts features you will not find on any other system on the market, ensuring unmatched power, fitment, and sound levels.

AWE has spent considerable time examining how to maximize the performance and options of this exhaust system. The AWE Tuning exhaust boasts features you will not find on any other system on the market, ensuring unmatched power, fitment, and sound levels.

AWE has spent considerable time examining how to maximize the performance and options of this exhaust system. The AWE Tuning exhaust boasts features you will not find on any other system on the market, ensuring unmatched power, fitment, and sound levels.

AWE has spent considerable time examining how to maximize the performance and options of this exhaust system. The AWE Tuning exhaust boasts features you will not find on any other system on the market, ensuring unmatched power, fitment, and sound levels.

AWE has spent considerable time examining how to maximize the performance and options of this exhaust system. The AWE Tuning exhaust boasts features you will not find on any other system on the market, ensuring unmatched power, fitment, and sound levels.

AWE has spent considerable time examining how to maximize the performance and options of this exhaust system. The AWE Tuning exhaust boasts features you will not find on any other system on the market, ensuring unmatched power, fitment, and sound levels.

Built in the AWE state of the art manufacturing plant, the B7 S4 exhaust is a direct bolt on catback system that not only transforms the rear end of the car with it's menacing quad tips, but also turns heads with a deep muscluar bass note.

Built in the AWE state of the art manufacturing plant, the B7 S4 exhaust is a direct bolt on catback system that not only transforms the rear end of the car with it's menacing quad tips, but also turns heads with a deep muscluar bass note.

Built in the AWE state of the art manufacturing plant, the B7 S4 exhaust is a direct bolt on catback system that not only transforms the rear end of the car with it's menacing quad tips, but also turns heads with a deep muscluar bass note.

Built in the AWE state of the art manufacturing plant, the B7 S4 exhaust is a direct bolt on catback system that not only transforms the rear end of the car with it's menacing quad tips, but also turns heads with a deep muscluar bass note.

AWE Tuning has spent considerable time examining how to maximize the performance and options of this exhaust system. The AWE Tuning exhaust boasts features ensuring unmatched power, fitment, and sound levels. And awesome appearance, too!

The catback system is topped off with AWE Tuning signature 3" beveled exhaust tips. The tips sport precision stamped AWE Tuning logos and are double walled to ensure a mirror polish even under hard usage. The system has multiple slip joints with high quality t-bolt clamps, to allow optimal adjustment.

AWE Tuning has spent considerable time examining how to maximize the performance and options of this exhaust system. The factory exhaust consists of a long downpipe with two catalytic converters, and two rather large mufflers in the section after the cats.

AWE Tuning has spent considerable time examining how to maximize the performance and options of this exhaust system. The AWE Tuning exhaust boasts features ensuring unmatched power, fitment, and sound levels. And awesome appearance, too!

AWE spent considerable time examining how to maximize the performance and options of this exhaust system. The factory exhaust consists of a long downpipe with two catalytic converters, and two rather large mufflers in the section after the cats.

AWE exhausts have earned praise from owners and the press alike, due to their unique "Jekyll and Hyde" personality. They have spent considerable time and effort during development to achieve remarkable civility when idling and at part throttle cruising, while also producing a war-cry wail when full throttle is applied.

AWE exhausts have earned praise from owners and the press alike, due to their unique "Jekyll and Hyde" personality. They have spent considerable time and effort during development to achieve remarkable civility when idling and at part throttle cruising, while also producing a war-cry wail when full throttle is applied.

AWE exhausts have earned praise from owners and the press alike, due to their unique "Jekyll and Hyde" personality. They have spent considerable time and effort during development to achieve remarkable civility when idling and at part throttle cruising, while also producing a war-cry wail when full throttle is applied.