I have been toying with the idea of the K&N intake, at the very least the Focus will ultimately see the K&N drop-in filter at some point.
The Steeda rear sway bar is definitely a possibility though, I've heard great things about it.
I'm sure I could get away with some light modifications in the drivetrain/chassis departments but don't want to push my luck.
2012 YB ST-Converted Focus Sedan [Performance Ford, Sept '14]
1992 BW Grand Prix SE Sedan [restomod project]