I ran just the rear for about 2 yrs...it was an H&R 24mm set to its stiffest position...was fine for eliminating understeer but the body roll, slight as it was, was still there so I added a front as well. I think a 24mm will suit you just fine as should a 22mm being that most brands are adjustable. If you are looking for serious change...go 24mm and play with the adjustments...and then a front ARB when you determine flatter is better for aggressive cornering should your dampers and tires also be up to the task.