the E30 M3 was primarily, a tarmac rally car, and successfull as well. E30's won 5 or 6 national British National Tarmac Rally championships, as well as several european rallies rounds if my memory serves me right. These cars mainly ran on Leda coilover suspension, with revised front suspension geometry to cancel out bump-steer.
even WRCars today do not have ABS, or electronic driver aids. They do have electronically controlled diffs to put the power down quickly on the wheel with the most grip though. You will be surprised how late you can brake in a rally car on gravel, with the right tyres and brakes.
a good driver and navigator team can make it look easy, why? coz with good pacenotes, it can help the driver place the car with precision for every corner, which is why in rallying, there is usually no margin for error as there is no run-off. all that slipping and sliding around is a combination of on-the-limit driving, and technique. You can also see the driver execute a scandinavian flick in the 3rd segment of the vid from the start, coming down hill, flicking the car towards the right, and oversteering the other way into a left hander hairpin.
i have some info on E30 rally cars, need to go dig it up...
check out this link for some more amazing precision rally driving.
http://www.gigigalli.com/video.htm