I don't think there are any shortys or longtubes available for the 2nd gen 4.7L. There was a thread that a company was trying to get enough people for some longtubes but there wasn't enough interest I guess.
I think there are 2 reasons the 4.7L doesn't get the attention: 1) why when you have the 5.7L hemi available would they waste time/money building parts for the 4.7L. There are few that really try to build up the smaller engine. 2) I think that chrysler announced that they will be discontinuing the 4.7L engine in the upcoming years, so why invest in a engine that will no longer be around...
I think there would be alot of interest if a company decided to make shortys, rather than longtubes. I'm sure we could get 20 members on this site alone to commit to purchasing shortys that cost a few hundred bucks. Most don't want to spend a grand on longtubes.
Breathing in and out is good enough for me.