Just finished the body bushing upgrade about 5 hours ago.Couldn't wait to get the SS on the road. I just didn't believe it would make as big a difference as it did. Even my wife noticed the difference as I was blastin' up & down the back roads on our way to dinner. The car was so much tighter and the rattle factor of a nine year old car was reduced by at least 50%!! Read all the different write ups about this mod and once I got started it took about 90 minutes. That included the setup and tear down with the floor jack and jack stands. If you have not done this mod you really need to!! You don't know what you are missing. Got my bushings from GMPartsDirect.com. Still waiting for the ZQ8 bumpstops to arrive.