Has anybody tried the new IRS bushings that Maximum Motorsports is selling now? I just ordered my suspension components and they said what about IRS bushings. I was not aware they had any and said sure if they are firmer then stock. I know that a few have done the Steeda bushings, but I think these look more solid. Also Steeda's picture shows only 2 bushings and Maximums picture and instructions describe installing 4.