Using crossed, seeded nozzle beams, we have studied the detailed dynamics for the reaction of HI with three amines. Reaction with tri-n-butylamine and with quinuclidine gives product distributions which are forward peaked in the center-of-mass system, indicating a modified stripping mechanism. Reaction with tetrakis(dimethylamino)ethylene gives a symmetric distribution, indicating a long-lived complex. However, at high relative energies, a fragment ion is also produced which is forward scattered, suggesting that two different sites can be protonated by different reaction mechanisms.