I bought and installed the Banks Power Pack setup on my early '91 non-intercooled Ram 250 - it was the intercooler and exhaust system kit - no point in the turbo part of the Banks kit, since early '91's had a turbo that already put out 20 psi at full boost...
The kit went on as easy as could be expected, and worked as advertised - I was VERY happy with it - no problems of any kind!
With that kit, a Power Shot 2000 propane kit and injector pump tweaks, that truck would stay with ANY of the newer trucks, Fords, GM, etc. , pulling in the hills!