I can tell you from my experiance, there is night and day difference in the factory set up and the Helwig new bars. I put them both on in the driveway and even my wife that doesn't know a thing about cars or suspensions, knew there was a change on the very first drive. I would think the rear was the one that would show the most change, but I can't tell you that for sure as I installed both before pulling out of the drive. I would not spend the time nor money to just replace the bushings, lot of work and probably nowhere near the same results.