Err, well I already got the T and it's 1/4 diameter because that was what was originally there. They didnt leak ever, just the passenger side lines were all leaky. And yes, there are two plastic T things, one up by the injection pump and one back by #8.
As far as hard projects are concerned, the ONLY reason why I am attempting this is because my friend wanted to help, same one who put the stacks on..... Has any one on here put a powerstroke intercooler on their stock 7.3 IDI? I have a lot of good pics of a PS intercooler going on a 7.3, but with the ATS aftermarket setup..... If anyone has any pics it would be appreciated. I do have the blue rubber ford boots, that went with the intercooler originally. Right now we're trying to disassemble the front end, and its a bear. Routing of the tubes appears to be a challenge at best, just about EVERYTHING is in the way! But heck, it sure is gunna be kewl when we're done!!!!