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Any body extension can be considered detrimental unless it's benefit is larger than it's cost (not money cost, aero cost).
Each extension you add also adds skin drag and could create higher dynamic rolling resistance, etc... You have to ensure that the benefit of the mod will outweigh it's penalties.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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