A new instrument, the turbulent ion flow tube (TIFT), has been developed for studying ion-molecule reactions up to atmospheric pressure. The instrument is based on the turbulent flow neutral reactor developed by Seeley ee al.,(8) and it operates under turbulent rather than laminar flow conditions. The TIFT is currently designed to operate at room temperature over a pressure range from approximately 20-750 Torr, although higher pressures are possible with minor modifications. In this initial report, 300 K rate constants and product distributions, measured from 25 to 700 Torr, are presented for the reaction of SF6- with SO2. Both the rate constants and product distributions for this reaction are independent of pressure, and the present results are consistent with previous measurements made at <1 Torr.