Do not put it on the diffuser. Well, you can try, but there's not much point since it's plastic (with no clear coat), and it'll probably just leave a bad white haze.
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E82 '13 135is - Space Gray/Coral Red, 6 MT,
Heated Seats, 50% tint, clear bra, BMW Perf. Grilles, BMW Perf. CF Diffuser - #180/586
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