when I had stock rear wheels my car would slightly veer to the side but it was controllable. With wider non run flats and a LSD, I can get it to break traction but it does so in a straight line.
It was never as extreme as you describe and I dont suggest you turn off the Traction Control and romp on the car in the rain. You may crash.
MY Build Log
08 AW 135i | Cobb | ETS FMIC | ER CP w/ Tial Bov | AR Catted Downpipes | Berk Mids | Meisterschaft GT SUS 1M |M3 Control Arms | M3 Sways | M3 Rear Subframe Bushings | Wavetrac LSD | AST 4200 DA Coilovers | HRE R43 | Hankook R-S3 |Full BMW Performance Interior | Revozport 1M Raze Aero Package in Satin Carbon |1M Body Conversion|