If you're going to drag race at all, Vortech hands down. Ultimately the PD will give you more power only because it's a 9#er. However the A-trim is easily upgraded to 10 #s. The PD is silent and the Vortech sounds bad!! Get the Vortech!!
------------------
92 GT, 4:10 gears, centerforce clutch, 6# powerdyne blower, bbk h-pipe, flowmasters