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How much difference am I gonna see from 1 brand of catback exhaust to the other. I mean Tanabe is like 500+ and Hp is like what 200+. Will I really notice that much difference from lets say HP to DC Sports or Tanabe because 500+ is a little much right now. I can get a whole system for 500+. HP Header and catback is only 500+.

 
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the difference between just catback systems is not really a whole lot, there is some but even a good catback can only give like 1-2hp if that

 
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You want a straight through system with mandrel bends. Once you have narrowed the systems down by those 2 requirements, pick the one you like by looks and sound. The 500+ systems may be of higher qualitly when talking about materials used, but may not necessarily produce more hp.