To me the best reason for using the Spectra Tank system is that it uses the OEM vapor separator/vent system. Been using mine since they came out. Also from Rock as the distributors either did not have them or had a very high opinion of its pricing.
Craig

2014 Ram 1500 Laramie, 73 Cuda
Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango
Only previous Non-Mopar: Schwinn Tornado