I wouldn't recommend the boom tubes, if you to add headers or an o/r pipe later I think the straight through type mufflers,( SLP LM ,MAC Boom) sound aweful, check out this clip with my set-up, it ferocious when I get on it and very deep when I am cruising.
http://www.houndbite.com/?houndbite=848
Hope this helps, now if you do get the regular axle backget U-bolt clamps, don't use the band clamps that come with the MACs, they suck !!!! lol