Can't you got with the 4" and raise with the lower cup till happy with height? Also it would help with cup clearing ground if it was ever an issue? Looks like cup has over an inch of adjustment.
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2014 Nismo #158
K&N, HKS, 1320 Test pipes, Ecutek tune by Dynosty, Window tint 35% all around,Zspeed belly pan
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