This is a long read, but I've seen some wrong advice so I'll clear it up (atleast for Dallas)
The Tint laws here in Texas are pretty good. You can go as dark as you want (limo) in the back. The law in Texas only applys to the side windows, which can only be 35%. I have 5% in the back and small side windows, and 35% on the driver and passenger windows. It costs about $180 to get it done right. You can get it done a little cheaper, but you get what you pay for, and the stuff really takes a beating here in Dallas. You don't want it to turn purple in a couple of years. Go with something good like Vesco, or 3M. I've used both and never had a problem, plus they both warranty their product. I didn't like it when they stopped the tint at the dot matrix in the back window, so I had a dark strip of vinyl put over the top and it just looks like one big piece of tint. I got mine done at altamere on Lemmon, they did my stang and my wife's BMW and they both look great. She went with HuperOptiks (sp?). anyway it cost about $400, but that stuff isn't that dark and really blocks out about 80% of the heat, ask for a demo, it's amazing.
Hope this helps.
PS- I've never been pulled over for tint, I've had it for 5 years and Mine is DARK!!!
