I did a quick search, jacking rails are for 15-20 year model, should be fine year wise. From convertible to gt you may want a couple washers as the rear mounting points go over the convertible brace to the body.
No, but it stops it from making it handle like a boat. Many reviews on the handling can be found on here and youtube if you are curious. My opinion was it finally felt like a proper sports car after installing it.
I am consolidating my FS links here since most items are for pickup in So Cal (Orange County area):
20x10 +40 5x114.3 MRR VP7 Wheels & Pair of 295/30R20 Pirelli PZero's
Beith Carbon Fiber Wheel, Wind Restrictor, Diamond Quilted Floor Mats, Clutch Pedal Extender, Cargo Mat, Organizer, Rubber...