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Full frame or inserts?
Inserts are the cheapest route. In any case you want to look at the attributes of the windows themselves. Not all window glass is the same. The can reflect varying abouts of heat l, UV, light. Local/state building code will tell you what's code min for your area.
Frame composition is important as well. Vinyl covered wood, fiberglass, aluminum, wood.
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"Drive more, worry less. "
435i, MPPK, MPE, M-Sport Line
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