Yes, plus even over the factory, it is not so dark that you can't see out of the windows. Plus it helps with headlights from the rear at night. The percentage is the amount of light that is still allowed to pass through the tint, hence a 5% tint would be considerably darker.

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2011 X5 35i Space Gray/Black Nevada Leather w Dark Bamboo Trim
Convenience Pkg/Running Boards/Cold Weather Pkg/Comfort Access
3rd Row Seating/20% Tint/Style 215 wrapped with Toyo Proxes ST II/ LUX v4

2001 X5 4.4i TiAG/Grey Leather-Retired
djbock's Custom X Page!