it could also have to do with warranties as it did with my installation. For 3m it was about $100 more but came with lifetime warranty and the kicker was that any 3m building would do warranty work if say the shop I went to ever went under
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'04 E46 M3 - Silver Grey - Sold
'09 E92 335 - Space Grey - Sold
'12 E92 M3 - Frozen Silver - Current
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