Yes they do make one, as I've just fitted one to mine.

The airfilter on the FRS does not sit where it does on a 1.4/1.6/1.8/2.0 Focus, it actually sits in front of the battery (underneath). Attached to the turbo. So a Viper kit would be fine.

And if you upgrade to a GT28 or a 30, you will deffo require an Air to Air cooling system as GtechR mentioned. But you will need to replace the charge box with the battery, not the battery with the filter. You get a panel with the intercooler kit to mount the battery...