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I've got 3m crystalline @ 40%, which gives me a 37% net VLT. It provides an added amount of UV & heat rejection over the Color Stable tint. It's GPS/electronic device friendly (no metal).
You want to stay away from the 3m Black Chrome or 3m FX-HP series if you want 0 problems with your electronics (metallized tint).
3m color stable or crystalline is fine.
I paid $230 for 9 windows w/3m crystalline 40 and my sunroof with 3m CS20.
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