The ROAD! It doesn't have to lead anywhere. Just DRIVE! For the good of your heart and soul. Nobody is going to pull you over for just driving; and if they do, you say you're on your way home after a fruitless shopping trip at the local market.
I have c. 33K miles (earlier, somewhere on here, I said 34K, but I was brain farting 32K; don't know why this happens


).
Maintenance is more than I am used to with junkers as my rides. The last one was the c. 30K miles - equates with Canada's "Service 4", which is the biggie; it was well over $700; but includes full replacement of fluids and filters and a thorough bumper to bumper check and lube, etc. I can handle this. I understand it's a lot less than a German maintenance plan. "Real" high end cars are just ridiculous; a friend replaced his Ferrari for a 911; the Ferrari had $6K wheels and $1K "oil changes". Heh!? The wheel price was avoided by repairing the bent one for c. $600.
"Subtle" differences mostly related to how buttoned down the rear feels, especially when cornering. I followed the advice of an installer on YouTube who said that the factory should send Stingers out with this sway bar. It is the single most effective difference for the least investment. I agree that it was well worth the money for the return in feel. Handling, actual grip and control? I don't think so. A professional driver might even make greater speed in a curve with the OE sway bar than the
aftermarket stiffer ones; but not a "normal" driver. Because the rear feels more buttoned down, it fills me with greater confidence so that I drive faster with the
aftermarket sway bar, than I would with the rear going up and down and stepping out. A pro driver like Randy Pobst adapts to a car; and he said that the Stinger is "well balanced", if also "softly sprung and damped" compared to higher end performance sedans. The Stinger handles predictably and responds to what these higher level of drivers impose on it; they don't complain of "floaty" or "loose" handling in the rear, because although it exists, they discover it at once and adjust to the car. "We" mostly can't do that at our level of driving skill. So, the Eibach is a good stopgap until we "arrive there" (higher driving skill). I find myself pushing through curves now far more aggressively than a year ago (right after I got the sway bar on). I probably take the clover leaf 10 MPH faster than a year ago using more gas. I don't notice any stepping out or floaty movement. I am still holding off getting the front Eibach, because I like how my car feels and handles as it is.