I recently purchased a cat-back for my Fiesta mk5 Zetec-S. Cannot fault it, looks and sounds perfect!
Milltek Sport have completed development of a 3-inch full turbo-back exhaust system for the new Ford Focus RS 2.5T.

The Milltek exhaust system is designed to provide a significant performance increase, especially in conjunction with an ECU remap, and also boost the aural credentials of 5-cylinder engine even further. It's available as a cat-back system, which consists of a centre section, rear silencer assembly and, left-hand and right-hand DTM-style tailpipes that perfectly compliment the aggressive styling of the car. The full turbo-back system adds a large-bore downpipe (with adjustable bracket) and a hi-flow sports catalyst for maximum power and response gains while maintaining emissions within legal limits.