I have the 18mm on my car, I notice that if I come into a corner hot with neither Power or brakes I will understeer. but as soon as I hit the power the rear snaps around. I have a tendancy to Brake before the corner, go into it as nuteral as possible then either let it understeer or bring the Tail around as neeeded. It's a little demanding on the brakes and the Neck, but it helps my "Point and squirt" Driving style, I figure that it's a good style for roads that you don't know all that well. so I think that the 18mm is a very nuteral bar.....I depends on your style too. do you have much experiance with Oversteer?? I think I know someone with a 24MM....Matt you out there??