2010 Cat back drone - advice

I just picked up a 2010 GT that has an existing cat back modified exhaust. I don't know what brand It is, but it is LOUD. I don't mind the volume much, although I wouldn't mind not making quite so many enemies in my neighborhood, but the bigger problem is a very loud drone when cruising at some lower RPMs that actually makes conversations and radio difficult. I'm wondering if there is a solution other than replacing the entire cat back, and if not can anyone suggest a tamer cat back that won't cost me a ton of cash?

Thanks in advance for any advice
 
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