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Punch out OEM cat.
For just the header: Cost = 3 gaskets and about a 1 or 2 hours.
To decat header and front pipe: Cost = 4 gaskets and around 3 hours.
I had typical results from a punched out OEM header as I did with a Tomei UEL.
The catless OEM was ALOT less noisy/raspy than the Tomei.
The heat sheilding on the OEM works well, you need a thermal solution with aftermarket, ceramic coating doesn't come close to OEM sheilding, wrapping works much much better.
You can get a cheap 200hp from a full OEM decat and the right tune.
If you "want" a good header get a good 4:2:1 and apply your thermal solution.
If you want to quiten it down a bit after a full decat I recommend a 2.5" duel resonated front pipe (no retune required)
If you were in Sydney you could use my old decatted system off my 2017 (same header design as yours).
IMO spend the majority of your money on a good tune.
Opinions may vary
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