Dude, try and nut out a DIY intercooler for yourself and you will find that squishing a silicon hose past the headlight is the only way bar cutting holes in sheet metal or running a body lift and going underneath.
And to the OP i dont know why the XR6 unit is the favorable option for a DIY FMIC. I think maybe one guy did it on here with what he had lying around, then a few others decided to copy him.
You really want a cooler that has same side in/out, otherwise you are running another pipe the whole length of the cooler for nothing.