I'm glad you asked the question, I was wondering the same thing. I don't like the float from the under tuned rebound in the stock shocks.
I wonder if the reason Ford put so little rebound in the stock shocks was for drag racing. On the stock All-Season rubber, I suspect adding more rebound, thus reducing the quick front rise, could cause more wheel spin from a dead stop with slower weight transfer, but I'm no suspension expert.
This is the first Mustang, or any car for that matter, that I've ever had a car that the suspension "topped" out before if "bottomed" out. When I travel over pavement with a quick rise then fall, I hear a pop when the shocks are fully extended.
Kinda annoying to be honest. Why should I have to spend $600 for new shocks on my 5-month old car?
2015 Mustang GT PP 401A Black | 2015 Kawasaki ZX-14R