Take a listen to our new B9 S4 valved exhaust system!
The full exhaust system is made from high quality brushed T304 stainless steel with TIG welded joints for an exceptional look and durability. Exhaust gases are channeled through the integrated x-pipe, into your choice of a resonator or a resonator delete section, and then on to the 3 chamber in house designed mufflers where you, the driver, are in control of where the exhaust gases go from here. With the valves open, we showed gains of 21 WHP and 38 WTQ on our B9 S4 equipped with our Kohlefaser Luft-Technik intake, front mount intercooler, charge pipes, and a JB4 tuner!
In normal, MMI comfort setting, the valve remains closed and exhaust gases are directed through the channels of the mufflers, where sound reduction takes place. By utilizing the factory exhaust valve motors to integrate into the OE valve controller, simply changing the MMI setting to dynamic/sport unleashes a straight-through, raw, unedited exhaust symphony. When the exhaust valves open, exhaust gases are channeled straight through the wide open sections of the mufflers for an unrestricted, passageway.
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