Our exhausts have earned praise from owners and the press alike, due to their unique "Jekyll and Hyde" personality. We spend considerable time and effort during development to achieve remarkable civility when idling and crusing at part throttle, while also producing a war-cry wail when full throttle is applied. Our exhausts are like bespoke suits: each is hand made utilizing only the finest casing and packing materials, and they command respect without calling unwanted attention to themselves. Sophisticated, refined, and powerful, all at once.

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.

We now offer a free flow option for purchasers who wish to purchase both our downpipes and a Twin1 or Twin2 exhaust system at the same time.

The AWE Twin1 and Twin2 Exhaust Systems maintain individual exhaust streams, eliminating the bottleneck normally found after the downpipes, and freeing up power. As compared to stock, the diameter of the Twin1/Twin2 tubing is a whopping 35% larger in cross sectional area. By keeping each exhaust stream separate, the Twin1/Twin2 also allow exhaust gases to maintain velocity and the engine to work more efficiently.

Besides fantastic looks, tone, and power you can feel, what really sets the Twin1/Twin2 apart from all other dual exhausts on the market is their perfect fit. With the AWE Tuning Twin1 or Twin2, you maintain excellent road clearance with zero leaks, rattles, or periodic adjustments.

Please click here to see a gallery of the Twin1 and Twin2 systems with detailed pictures and a quick videos highlighting the great sound.

Click on the icon above for an actual dyno sheet comparing the AWE Tuning Twin2 true dual exhaust vs. stock exhaust on a 2001 Audi S4. Power is to the wheels (multiply by 1.28 for crank power). Twin2 horsepower is green line, Twin2 torque is blue line.

Click on the icon above for a dyno graph of measured differences between baseline and test in above dyno sheet. The Twin2 produced a peak increase of 8 ftlbs at 2500 rpms and 6 hp at 5800 rpms to the wheels over the stock exhaust.