This time zoomer responded: Just figured i'd post it up for the hell of it.
1. you need the 3800 unit for GM pump or rule pump. that way both fittings are on the same side
2. Similar but on the GP it's a little different because of the hood latch support which we normally drill a hole through for final mounting tab.
3. We have not done any testing other than fluid capacity. We made them due to customer demand and market changes, then changed the design for cost reasons on our end. We understand the dynamics of intercooling well enough to believe it's a better piece but with sales quadrupling we don't have incentive to do an A/B best until we get our M90 track car back out which won't be til next year.
Zooomer