never seen the OBX one but just twin loops in general are really pretty good... friend had it on his lude sounded sick... i was gunna come up on a used mugen twin loop i was just gunna cut it but then i found a fujitsubo one for cheeper...
OBX makes some quality mufflers. Ive had mine on my car for about 6 months and it doesn't sound ricer at all.
the B9/B10 looks good. Twin loops look ghey!