Muffler- I must believe you know what this is
Resonator - Basically its just a muffler before the muffler, it's straight through design packed with fiberglass or the sort to absorb some sound. Some people argue whether they really help or not
Pre-silencer - Don't think ive heard of PRE-silencer but i have heard of a silencer, which is basically something you can put on your muffler to help tone sound down a little more at the cost of hurting flow of course.
I really don't know how loud your exhaust is but it's never really going to be that quiet simply because its a 3" exhaust.
Hope that helps