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Mike, Yes, I'm happy with the outcome. The window tinting does help although I can't say how much or to what degree. I live in AZ where the sun in brutal in the Summer, and if your car sits outside uncovered for any length of time it's going to get hot no matter what you do, but every little but helps.

I had my windows tinted without removing them. I had to try a few shops before I found one that was willing to tackle it. It turned out great but I'm sure it was not easy to do the rear window. You may need to spend some time taking the car to different shops and getting estimates - some of them may be ridiculously high in hopes that you'll go elsewhere.

The Studebaker Avanti shop manual gives a pretty step-by-step guide of what's involved. This has also been covered many times in the AOAI magazine and SDC's Turning Wheels. Bob Johnstone's Avanti page is another good source of info. For specific questions you can always ask here and someone who's "been there and done that" will usually chime in with an answer.