Great information on this board!

Another couple of question, Later on if I decide that I want to upgrade the turbo to a bigger unit what would fit the manifolds and is still draw through, where would be a good place to look?

The information provided by the seller say: TB0304 A/R .42/.82 Garrett T type...

What do the numbers breakdown to mean? Thanks in advance. It arrived to me a day early, it should be waiting for me on my porch as I type this!