With my '95, I modded stuff that I identified as needing replacement soon anyway. Front brakes, wheels/tires, suspension...the only "performance" mod that I did for the sake of performance was an SVT exhaust. It was a nice way to do stuff to the car in increments, justify purchases to a skeptical spouse (yes indeedy), and when I did sell it, I could at least say "oh, the struts and springs and brakes are new within the last 10K miles". I wish in retrospect that I'd swapped my SVT and SE exhausts, but at the time (and now, still) I had plans to do a 2.5" stainless Magnaflow single-pipe setup, so I left it as is.