I see you're in Louisville. Does Kentucky do emissions testing? If so, then the off-road pipe is not a good idea, unless you don't mind swapping it for your stock one for when you do the testing. You won't pass emissions testing with the off-road pipe. You probably will pass with the high flow cat.

To summarize my earlier post, the off-road pipe vs. high flow cat is a tradeoff.

Off-road pipe: lose low speed power, gain high speed power. Also, not emissions legal.
High flow cat: no change in low speed power (I think), gain high speed power (but not as much of a gain as the off road pipe). Probably emissions legal.