Cat
Make sure it actually has a cat. There is a problem with backpressure. PO could have removed the guts to the CAT and the Turbo is off because of lack of backpressure which sounds against all possibility but it creates a swirl in the cat without the ceramic material on the inside. Most people have to cut the cat to get the material out look for the re-weld lines.
My original CDI got better fuel mileage and had more power but not much. I always wondered if the first had a tune on it that I did not know about.
I run WVO in mine on a two tank system. It is a great car. It is even better when you use 3 gallons of veg oil for each gallon of diesel.
Good Luck.
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