I went from the 1" to a 11/8" bar that I found at a wrecking yard, honestly felt no difference, car does roll a bit as pictured. But does feel very stable, and predictable. Have the old AZ springs with the Koni 1152 shocks in front and some Koni's that AZ Z Car was selling, urethane bushings all around. Power output is probably pretty low considering I have a 30+ year old wrecking yard motor in it. So sounds like advice JHM gave is in keeping with my set-up