To address the OP's question; I had 35% tint on a Black/Black car when I had the Audi, I always regretted not going darker. The last two cars I've had, including the TSX have been black on black and I've gotten 20%. While it does get pretty dark at night, during the day it's not as bad as a 15% or 5% tint.

"archerandsons" - Nice Wheels! 350z??