First thing I did when I got the car. I went 20% all around and man, what a difference. It feels cooler, looks much better and you feel like you have privacy. Before I had my windows tinted, I felt like everyone could see me through all the big windows of the car. Mine is silver and the car looks awesome, but with your STS-V being black, it will contrast very well and give you the killer stealth look. It did NOT affect anything on the car at all. Radio reception and everything is still ok.
SG