i didn't vote. i believe it is a matter of opinion. i have the baumann kit, and am very happy with it. mark mccormick also has the baumann in the batmobile, and he is also very satisfied...and he puts down a lot more power than i do. nothing against transgo, just haven't used it. someone who has will chime in that it is great, so really, it is up to you. the baumann kit cost me $60, and the pressure relief valve(optional) was $40.
2003 Ford Expedition: 5.4L, harley supercharger, 2.93 upper pulley, 4lb lower pulley, c&l plenum, jlp cai, LFP SBTB, FTSP, Magnaflow 3" catback, Eclipse AVN-5510, white face gauges, cobalt c2 boost gauge, ddm hid's, 379 rwhp, 465 rwtq sold 11/3/12
2009 Ford Flex Limited AWD