Installed my dss drive shaft yesterday on my performance package car. The factory drive shaft was bit different then my 14. Where the drive shaft connects to the tail shaft of the tranny it was bolted onto a hard rubber spacer with metal bushings passing through it for the bolts. This I believe is where a lot of the drivetrain back lash is coming from. Once I got all of that out of the way the dss shaft went right in. Within the first 100 feet I could instantly tell a difference in the drive of the vehicle. A lot smoother no more backlash. its hard to say if the car is any faster lol but it did what I was hoping it was going to do and that was smooth things out a lot!