I got my windows tinted with 35% about 2 weeks after I got my car. I was told by the guy that 35% is the lowest you can go before the cops really start busting your chops. I've NEVER had anyone tell me to take it off in the two years i've had it.

1999 Silver Frost SVT #609 of 2760 Quaife, lightened SVT Flywheel, SPEC stage II clutch, removed resonator, k&n drop in - various other goodies too.