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no oil in the wells. No codes. IT currently has no cats and has true duals. Could there not be enough back pressure. The wires look good but they are original it appears.
I would pull your plugs and inspect them. If they are not motorcraft you need to replace them. 3 out of the 4 SHO's I have bought have had the wrong plugs in them and they typically will not last 10k without having problems. I would also suspect your wires arcing if there are no codes. Replace these two items and you should be good to go.
The blinker fluid is fine I just topped it up. It has good plugs and they are the right ones. I think I will just order some wires when I get the money and go from there.