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We introduce super exponential inflation ($\omega < -1$) from a 5DRiemann-flat canonical metric on which we make a dynamical foliation. Theresulting metric describes a super accelerated expansion for the early universewell-known as super exponential inflation that, for very large times, tends toan asymptotic de Sitter (vacuum dominated) expansion. The scalar fieldfluctuations are analyzed. The important result here obtained is that thespectral index for energy density fluctuations is not scale invariant, and forcosmological scales becomes $n_s(k<k_*) \simeq 1$. However, for astrophysicalscales this spectrum changes to negative values $n_s(k>k_*) <0 $.

Super exponential inflation from a dynamical foliation of a 5D vacuum state