an axleback won't really make it super loud, unless you go straight pipes (slp loudmouths). Chambered (flowmaster, gibson, mac) are going to have a rumbly deep sound, and straight through (violators, magnaflow, corsa), will have sort of a mellow but better, purer sound from the engine. I've heard magnaflow and corsas in person which are both straight through design and they sound fantastic. maybe a little quieter than my gibsons.
I can set off car alarms a lot easier now with my axleback compared to stock. When you put a mid pipe on, that's when it truly gets loud.