Which Suspension?

[Eric523]

at 80k miles, it would be a good idea to replace all four, not just the rears.

PSS9 system is nice. Once set, you really don't have to ever touch it unless you want to stiffen it up for your track day. Also has fully adjustable ride height so you can lower or raise the car as you please.

Or just go with OEM Bilstein replacements shocks. Add the m030 springs if you want to lower the height a tad and be a little stiffer.

[thstone]

At 80K miles, I'd replace all four. Since you only plan to track occasionally, the PSS9's are overkill; the stock Bilstein replacements will be comfortable on the street and fine for track days.