I recently purchased my first Audi, a 2009 S-Line with manual 6 speed. The car has a Stasis Challenge quad tip exhaust installed on it that resonates very loudly, especially during highway cruising. It turns out the system was installed by the previous owner without the mid-pipe muffler. Checked with Stasis and they don't sell just that...you have to purchase a whole system. So, hoping there may be someone out there who has this component they could sell me.