ProChamber vs X-Pipe vs H-Pipe

ok so i've been looking for the mufflers and i see all this in/offset crap. what the hell does this mean, and which one do i need. i saw this on flowpath and 2chambers, i didn't see for the borlas, but just as a piece of info for future reference
 
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thanks, and if there's no difference besides length, i might as well keep the short ones for dump purposes. one more question, will i have a deep throaty sound which isn't too quiet but not too loud? or how would you describe the sound? thanx again 306stang