I just did the hood ones. They were a little tricky with the curves on the hood. I decided against the rocker stripes, and went with a black spoiler to balance it out front to back. It's subtle, but I like it.
I ordered the polyphil because that's what everyone else was doing. Lol
I'm not even sure what the benefits are. Obviously it's summer time in Phoenix and I certianly don't want a heat problem. Is it absolutely necessary?
I personally have not experienced this. But I'd think sport or track mode, or even just a manual flip of the paddle to downshift would eliminate this issue. In the old days I would always use overdrive when climbing hills anyway.
I've never had an issue with the 3 mustangs I've owned after tinting. My shop just says to keep the door use to a minimum for 24 hours if possible. If its properly installed its not going to peel.