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Catalytic converter, most go with the High Flow cat. I cant remember what the name of it is.
If you get aftermarket headers, you can go with many different routes. Here are a few examples:
Catless headers with stock ypipe and keep the stock bpipe with resignator
Catless headers with aftermarket ypipe and keep the stock bpipe with resignator
Stock headers with aftermarket ypipe and keep the stock bpipe with resignator
But neither will give you any real noticeable HP, unless you dyno it.