Cutoffs are cutoffs. They cut the light off at a specific point so you can aim them without glare going above that. Regular halogen lamps have a flat point where the light kinda stops, but it still spills above it. Cutoffs stop the light period and are what create the solid line of light/no light that shows in your beam pattern. High beam usage should be the only occurrence of no cutoff with projectors and HIDs especially.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne