If they are, it's probably only polarization (if you have a pair of polarized sunglasses you'll be able to see a thatched pattern in the glass). Most auto glass does have a very slight tint to it, but it shouldn't interfere with aftermarket tint specs.
thekeithlink wrote:Want to go darker but not too dark
Just a point to consider:I personally find dark tint on the front windows a nuisance more than anything. I removed the aftermarket tint from my front windows and night visibility is much improved. Sure, the car doesn't look as nice with only the backs dark, but my visibility is a lot better. If you're planning to tint the fronts, I would consider this when deciding how dark to go.