Magnaflow has just released a stainless cat-back exhaust system for the 2013 Focus ST.
5 x 14in. Resonator; 5 x 14in. Muffler; 2.5in. Tubing; 4in. Polished Stainless Steel Tips; DUAL CENTER REAR EXIT
The don't have any sound clips on the site, I'd be interested in knowing what type of performance gains will be had from this.
Source: MagnaFlow Exhaust Products - For Trucks, Suv's, American Muscle, Diesel, & Sport Compact Vehicles