In light of the ion-pair hypothesis, how would you expect the stereochemical outcome of an Snl reaction

Question:

In light of the ion-pair hypothesis, how would you expect the stereochemical outcome of an Snl reaction (percent racemization and inversion) to differ from the result discussed in this section for an alkyl halide that gives a carbocation intermediate which is considerably
Less stable than the one involved in Eq. 9.61?