I was just looking for the pics of the stainless exhaust (particularly the Y-pipe) that someone created on here, but I'm thinking maybe the links broke.
I've got headers, I was able to run the 2.5" pipe from passenger side to drivers side between the bellhousing and trans body. Stock height, no issues with the front driveshaft.
The auto trans might be a bit different in regards to space for the pipe between the trans pan and bellhousing, but if not, that's about the only place I could see making the crossover, otherwise you'd have to go way back...that won't work for a cat, and would somewhat negate the point of single exhaust.