Those air deflectors are rubber and will bend if you hit a speed bump and can easily be replaced.
So I started down the modification road, and quickly found out that the install price is pretty steep for just the springs and sway bars. If you go this direction, adjustable shocks, adjustable sway bars, ride height, stance enhancements and corner balance/moderate alignment are all great suspension tools. This gives you the ability to adjust to your own style of sporty behavior. From a cost prospective, doing these modification fully the first time, makes sense if you are going to keep the car for a few years. Just changing springs and sway bars with the install price, then later needing to upgrade to adjustable equipment and the additional install charge, due to stickier tires really hurts.
If your driveway can take 25mm drop, then you can have that cranked into your coilovers or less if necessary all the way up to OEM drop. You can specify your spring rate or just buy a standard setup like Ohlin Road and Track or JRZ RS1. Tarett GT adjustable swaybars are also a good way to go allowing for a more aggressive bar or not (5 holes in front and 4 holes in the rear). Tarett down links are also a must when changing to adjustable bars. Finally your tires then will dictate how much front and rear bar to crank in for a neutral cornering setup especially if you change tire brands and the tire patch is not the same as a standard 981 or you would like a stickier tire that changes the understeer/oversteer balance and stickier tires can add much more body roll. This suspension package can be much stiffer than OEM equipment, its up to you.
Or, you can just buy the X73 all in one system, which your wife may enjoy more than a custom suspension. But it lacks corner balance, compression/rebound, drop adjustability, balance change, or roll adjustment, but you still have tire pressures. Its like writing a research paper, you are forced to learn new material that adds to the enjoyment of the sport. Call a top suspension shop in your area for details of custom coilovers, swaybars, cornerbalance vs X-73 as they have experience with both systems.
Once you start using R rated tires like RE71R's, then higher spring rates, adjustable sway bars make sense along with more camber than OEM will give you. Cayman R would be in the 987 Boxster Spyder category. Ohlins spring rate is 70 front and 80 rear. Not sure about the total range of the Tarett GT adjustable swaybars for 987 Caymans. You can quickly add the spring rates and swaybar rates together to figure out how stiff the suspension is in total. X-73 PDK in the rear would be 50 n/mm (spring rate) plus 41.5 (swaybar)= rear 91.5 n/mm for each back wheel. My springs alone in the rear are 80 n/mm and depending on which of the 4 holes of the swaybar I chose would be higher than 91.5 n/mm. This spring stiffness helps on smooth blacktop tracks using RE71R's or Hoosiers. On rough tracks with a lot of bumps the higher spring stiffness reduces the tire contact patch unless compression and rebound rates are substantially reduced along with much less swaybars compression/rebound meaning a softer hole position would work for me.
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