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...
Square setup 295/30R20 Dunlop Sport Maxx Race Tires all around (tread almost gone, old tires, you'll want to replace). Ran w/ hub centric rings, 5mm spacers all around, racing steel lug nuts, and includes tpms sensors as well.
Pick up available in Orange County, CA. Not looking to ship. Not...
Put car back to stock.
Pickup available in Orange County, CA area. No shipping on larger items for now, sorry.
Beith Carbon Fiber Wheel with leather (2015-2017): SOLD
Diamond Quilted Floor Mats front & rear (small puncture on driver front mat, didn't notice until I removed it for sale): $100...
Put car back to stock.
Pickup available in Orange County, CA area. No shipping for jacking rails, sorry - don't have the boxes for it.
J&M Jacking rails (GT Convertible): $120 picked up.
Steeda hood struts: $100 picked up, $120 shipped.
Stubby antenna: $20 picked up. won't be worth shipping...
Put car back to stock. Only 11k miles on the car. exhaust sounds great. oil separators work well.
Pickup available in Orange County, CA area. No shipping on exhaust for now, sorry - don't have the boxes for it.
Borla Sport Catback Exhaust (for 15-17 GT, also worked on my convertible): SOLD...