[harryrcb]

Yes. I know your next question will be did it make a difference. That's a hard question to answer. It's not like switching on a light but theoretically it should. if you look at the rear suspension, it's like a giant U shape upside down, Porsche put a cross bar in on the front part of the U but not the back part. With the car on the lift you can move the rear part with a little help left to right so it only makes sense that the bar would help.
In my opinion, get it. the car does feel better at high speed.