Try to go to a place that installs luminar tint. Its great quality tint and the company guarentees the tint for I think 5 years across the U.S. Anywhere you ever have a problem with it you can bring it in to any shop that sells the stuff no questions asked (theres a lot of them). One thing that will change the color is glue, Its nearly impossible to get tint to stick to that damn ford dot-matrix that is around the outside edge of the rear window(thanks again ford

), so most places have to use glue so the tint doesnt peel off. I noticed the top inch of mine started to get a yellow tint to it from the glue, but its not really noticable.