Well... if a cheap mod is what the OP is after, might I suggest the following ghetto style.
1. Remove the stock resonators and replace with a straight thru pipe.
2. Cut open the stock mufflers and replace the original buffering material with a less insulated one. Weld back the cuts.
I'm not sure how that'd sound, but I'm certain there'd be an increase in the exhaust volume and note.
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