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On the expense side, a person would really be 'splitting hairs' vs a used aftermarket header. You can pick up a good aftermarket header used for around $400+/- some, and then you still have the OEM header intact if you want to return it to stock (or sell it for $50-$100). Paying someone to remove the cat and weld in an new pipe will be a couple hundred bucks at least. If you do the screwdriver + hammer method, that works, but flow is even less ideal and I hear it sounds pretty bad due to the resonance in the empty cat area.
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