Saudi sy tune

I am rebuilding my saudi sy (stock no modification) it seems that the o2 are disabled and the cats are removed(nm8) because of leaded fuel that was used in saudi back in the 90,s

Would it be better for me now to use the normal tune and activate the o2 ? If yes , how can i do that ? (Get a u.s sy chip ?!)

Need help here
Thanks
 
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