There have been a number of mods created to bring so much needed rally content to stock car extreme. Here is a list, that work well in STE. If you have played Richard Burns Rally before, then this is a nice follow on.

- Featuring around 15 Rallycross tracks, with varying terrain and surfaces.
Download[trippteamdownload.servegame.com]

- All 4WD and 2WD cars from the Group B era including the Might Metro 6R4, Quattro S1 and the Lancia Delta S4.
Download[trippteamdownload.servegame.com]

- Including MSport, Hyundai, Volkswagen, Citroen and Every Privateer that competed in any round of the WRC in 2014:
Download[trippteamdownload.servegame.com]

To install, just extract the folder into your Stock Car Extreme Directory. The cars should be found under the "All Cars" category in-game.

Note: I am not the author of these mods. Always make a backup.