ok whenever i drive on bumps/potholes of crappy toronto streets the rear of my 2.5i sedan makes a sort of side to side motion that gives me this horrible feeling that the car is about to fish tail. it never does fishtail though and keeps going straight. but it messes with my confidence lol. is this something because of the 4WD system? i don't get this my 3 other cars. my car is stock exception of '10 STi rear and whiteline front swaybars.